Merge pull request #98 from ysb33r/master

FIXED #97. Changes to jruby.gemInstallDir.
Merge pull request #99 from ysb33r/master

Fixed Groovydoc errors and added a copy task to copy Groovydoc to website directory
Added a title for groovydoc
Set gemInstallDir to use `${buildDir}/rubygems` as default