Bugfix: CommonLibrary error with multiple library types

When XXX_LIBRARY_TYPE is a list, e.g. STATIC;SHARED, CMake
fails on line 94.
Merge pull request #213 from eile/master

Improved version for #212
Extend SubProject
Make clangcheck target Superproject capable
Merge pull request #214 from eile/master

Make clangcheck target Superproject capable
Merging CMakeBBP into CMake.
Reset components for subsequent find_package
Move Doxygen-specific variable to DoxygenRule.cmake.
Merge pull request #216 from tribal-tec/master

Reset components for subsequent find_package
Merge pull request #215 from rdumusc/osg

Merging CMakeBBP into CMake.
Fixed Doxygit.cmake, removed doxygit target from DoxygenRule, added CommonDocumentation.cmake.
Merge pull request #219 from rdumusc/doxygit_v2

Fixed Doxygit.cmake for 'make doxygit', added CommonDocumentation.cmake.
Add dummy install target for common_documentation, as expected by Buildyard.