Support filtering part of the filename.

Coverity analysis may not be performed on the same directory as Sonar analysis,
so in some case we need to remove the beginning of the filename to make it
relative to Sonar's project root.

This can be done by specifying the prefix to remove from filenames with the
'sonar.coverity.prefix' key.
Fix name properties generation to include the language as expected.
Support C++ community plugin.
Fix URL of coverity instance.
Changing version to 1.0.2 for internal build.
Adding new dependency for xmldsig.jar
Adding Java.net repository for javax.xml
Removed repository from pom file
Removing dependency on xmldsig
Removed "Snapshot"from version on the pom. Modified the readme.
Fix null pointer exception if checkPropertyDataObj is not available.
Fix coverity metrics.

Count only outstanding issues: issues which are neither fixed nor dismissed.
Store name in XML file to improve sonar startup time.

This reduces coverity rules load time from ~20 seconds to less than 1 second.
Filter coverity issues based on analysis date.

This allows retrieving Coverity issues at the specified analysis date.
Fix: 65153
Merge branch 'master' of git.coverity.com:/home/git/sonar_plugin
Fix: 65518, 62066, 62490, 65055
Fix: 65518, 62066, 62490, 65055. And problems with the build.
Working on problems with jenkins
Merge remote-tracking branch 'typz/fileprefix' into franco

Conflicts:
	src/main/java/org/sonar/plugins/coverity/batch/CoveritySensor.java