fixed issue #5
implement of body.
fix example.
add LICENSE part.
fix object types.
fix response.
parse body content.
fix examples.
fix Request/Response object.
fix URL object.
cleanup.
move MRUBY_LDFLAGS to mruby-uv.
keep alive.
add .gitignore
add message.
use RSTRING_LEN.
Add GEM Specification for rake build process
Merge pull request #6 from bovi/rake

Add GEM Specification for rake build process
arena save/restore.
don't use static class instances