XCode: update project files
Source: Implement findSources()
TestSource: Fix compilation and test Source::findSources
Source: Remove findSource
Source: remove existsSource
[test] TestSource: add some more checks for findSources
Source: implement sources() via findSources()
[tests] TestSource: Fix small warning
Source: string var -> const var &
Source: use Source::sourceCount instead of group.objectCount
Source: Use getSource()
Merge pull request #17 from gicmo/findSources

Source: findSources implementation