Add CxxPublicApiVisitor which counts documented and undocumented public
API items.
Add UndocumentedApiCheck that creates issue for undocumented API.
Merge branch 'public-api-coverage' of git://github.com/lcintrat/sonar-cxx into lcintrat-public-api-coverage

Conflicts:
	cxx-squid/src/main/java/org/sonar/cxx/CxxConfiguration.java
	sonar-cxx-plugin/src/main/java/org/sonar/plugins/cxx/squid/CxxSquidSensor.java
Convert new line style to unix