Added support to overide CMake build type with env vars
Added travis support for multiple build types
Move env code part 1
Fixed wrong path in debug mode
Move env code part 2

Only just noticed I committed this on the wrong branch.
Prepended Travis to env vars
Merge pull request #767 from worktycho/envmatrix

Added support to control build type with env vars
Merge branch 'master' into Werror