YCMEPHelper: Remove unused and useless global property
YCMEPHelper: Do not add non-projects to the list of project

Documentation, templates and examples are no longer in the YCM_PROJECT
global property.

This fixes CDash trying to configure them.
Update release notes
Merge branch 'CDash_fix_documentation_projects' into ycm-0.1
Merge branch 'ycm-0.1'