Merge pull request #90 from ericcj/master

Fixes to build gem on ruby 2.0, parse hash values, array operations, and decrement
Version bump to 0.1.15
Regenerate gemspec for version 0.1.15
Merge remote-tracking branch 'adelevie/master'
raise on nested new objects instead of silently just not saving them since REST api doesn't support it, circular saves are impossible
bump