Fix glm::higherMultiple and glm::lowerMultiple and assoicated test cases. Does not fix the specialized versions of these functions
Merge pull request #80 from robert-ancell/0.9.4

Fix glm::higherMultiple and glm::lowerMultiple and assoicated test cases...
Updated cast test
Fixed merge
Completed GTX_multiple for negative values, issue #79
Optimized radians and degrees functions
Added half literals
Fixed dual quat built on GCC
Added GTC_angle extension files
Refacted GTC_angle
Fixed post in/decrement operators
Fixed missing typename
Fixed explicit empty constructors for specialized half classes
Fixed increment and decrement operators tests
Fixed documents
Merge branch '0.9.5' of https://github.com/g-truc/glm into 0.9.5
Removed scalar functions
Added vector type operator declarations
Fixed space characters
Added assert to row and column functions