v0.2.0

GPUToolbox v0.2.0

This is not a breaking release, it simply adds support for integer literals and some documentation.

Merged pull requests:

• Use support for gc_safe=true in Base if available (#6) (@vchuravy)
• Add support for literals (#10) (@vchuravy)
• setup Documenter (#11) (@vchuravy)

Closed issues:

• TagBot trigger issue (#2)
• Use @ccall gc_safe=true when available. (#5)