Merge pull request #29 from davedissian/master

Copy-paste error fix and added installation of inl files.
Add testing for MATH_ENABLE_UNCOMMON_OPERATIONS.
Fix more duplicately defined symbols when MATH_ENABLE_UNCOMMON_OPERATIONS is #defined.
Improve documentation explaining the rationale of #define MATH_ENABLE_UNCOMMON_OPERATIONS.
Added IrrKlang interop