Merge pull request #87 from ysb33r/master

FIXED #84 - Rolled compatibility down to JDK6
Upgrade the default JRuby version to 1.7.17

Fixes #89
Add the default gradle properties
Remove annotation on the gemWorkDir to prevent exec tasks from being 'up-to-date'

Fixes #91
Prevent JRubyExec from inheriting environment variables from RVM by default

This adds an optional setting called `inheritRubyEnv` which defaults to false.

Fixes #90
Switch from an ArrayList to a more conventional Groovy List
Use the task's set environment instead of blindly passing in System.env
Update the changelog for the 0.1.10 release
Added support for building on Appveyor