Added get_program_info_log
Truncated null bytes from shader logs
expose glGetProgramInfoLog as get_program_info_log
Merge pull request #11 from Jeaye/master

Added get_program_info_log
Merge pull request #12 from Jeaye/log_str

Truncated null bytes from shader logs
Merge pull request #14 from robn/get-program-info-log

Expose glGetProgramInfoLog as get_program_info_log