Add support for wildcards in excludedPages

It would be great to get support for wildcards in excludedPages. Currently I get a whole lot of false positives from my javadocs and xref documentation. It would be very nice if I could just exclude these pages from being checked using something like:

<excludedPages>
<excludedPage>xref-test/**</excludedPage>
<excludedPage>apidocs/**</excludedPage>
</excludedPages>

Excluded link doesn't really work in this case because most of the links in the javadocs are relative to apidocs. So there is no obvious pattern that can be used here.

Also the javadocs produce URIs that cannot be parsed by java.net.URI giving errors like the following:

[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] null
Illegal character in fragment at index 98: ./org/lds/stack/db/listener/ConnectionListenerDataSourceP
roxy.html#getConnection(java.lang.String, java.lang.String)
[INFO] ------------------------------------------------------------------------
[INFO] Trace
java.lang.IllegalArgumentException
at java.net.URI.create(URI.java:842)
at org.apache.maven.doxia.linkcheck.validation.LinkValidatorManager.matchPattern(LinkValidat
orManager.java:414)
at org.apache.maven.doxia.linkcheck.validation.LinkValidatorManager.validateLink(LinkValidat
orManager.java:132)
at org.apache.maven.doxia.linkcheck.DefaultLinkCheck.check(DefaultLinkCheck.java:558)
at org.apache.maven.doxia.linkcheck.DefaultLinkCheck.findAndCheckFiles(DefaultLinkCheck.java
:480)
at org.apache.maven.doxia.linkcheck.DefaultLinkCheck.findAndCheckFiles(DefaultLinkCheck.java
:439)
at org.apache.maven.doxia.linkcheck.DefaultLinkCheck.execute(DefaultLinkCheck.java:241)
at org.apache.maven.plugins.linkcheck.LinkcheckReport.executeLinkCheck(LinkcheckReport.java:
512)
at org.apache.maven.plugins.linkcheck.LinkcheckReport.execute(LinkcheckReport.java:412)
at org.apache.maven.plugins.linkcheck.LinkcheckReport.executeReport(LinkcheckReport.java:452
)
at org.apache.maven.reporting.AbstractMavenReport.generate(AbstractMavenReport.java:93)
at org.apache.maven.plugins.site.ReportDocumentRenderer.renderDocument(ReportDocumentRendere
r.java:164)
at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.renderModule(DefaultSiteRenderer.
java:330)
at org.apache.maven.doxia.siterenderer.DefaultSiteRenderer.render(DefaultSiteRenderer.java:1
34)
at org.apache.maven.plugins.site.SiteMojo.renderLocale(SiteMojo.java:158)
at org.apache.maven.plugins.site.SiteMojo.execute(SiteMojo.java:120)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor
.java:694)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifec
ycleExecutor.java:556)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.
java:535)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultL
ifecycleExecutor.java:387)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleE
xecutor.java:348)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java
:180)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: java.net.URISyntaxException: Illegal character in fragment at index 98: ./org/lds/stack/d
b/listener/ConnectionListenerDataSourceProxy.html#getConnection(java.lang.String, java.lang.String)
at java.net.URI$Parser.fail(URI.java:2809)
at java.net.URI$Parser.checkChars(URI.java:2982)
at java.net.URI$Parser.parse(URI.java:3028)
at java.net.URI.<init>(URI.java:578)
at java.net.URI.create(URI.java:840)
... 34 more