Address Sherm's comments about cmake macro.
Clean up OPENSIM_ADD_LIBRARY macro.
Merge pull request #221 from opensim-org/cmake-library-macro-2

Cmake library macro 2
Start cleaning up exp-based reporter plugin cmake.
Convert examples to use OpenSimConfig.cmake.
Remove unnecessary line from wrapping cmake.

Also, clean up an api example CMakeLists.txt.
Application tests need not specify simtk libs.