-Added create_context_with_properties
-Added write_async
-Made some objects public that are needed for gl_cl bindings
add lifetime
Updated to latest rustc
-Fixed all warnings
-Removed calls to deprcated function
-Rename CL to cl !breaking change!
remove debug
updated travis script
Merge pull request #2 from csherratt/fix_debug

remove debug
Fixed unsafe code
fail! -> panic!
readd secure token to .travis.yml