Fixes:

• Fixed asinh and atanh warning with C++98 STL #484
• Fixed polar coordinates function latitude #485
• Fixed outerProduct defintions and operator signatures for mat2x4 and vec4 #475
• Fixed eulerAngles precision error, returns NaN #451
• Fixed undefined reference errors #489
• Fixed missing GLM_PLATFORM_CYGWIN declaration #495
• Fixed various undefined reference errors #490