Added optional ratio type
Ratio is added to the data type mapping table in README
add build/release script - needs tweaking
remove build/release (redundant with rake release)
ensure cert/key are present before releasing
add example of reading non-utc date string
Merge pull request #10 from cognitect/ratio

Ratio type implementation
use point as example of unrecognized encoding
keep like things close
Initial marshaler impl
Merge branch 'master' into jruby
WIP writer impl