Merge pull request #405 from ScottKillen/develop

Update buildscript
Stop tracking package-info.java
Remove forestry api in favor of a git submodule
Removed thaumcraft api in favor of git submodule
Moved ATG api to isolate from main mod files
Moved New Dawn api for consistency and to isolate main codebase
Updated for latest Foresty API
Improved build script to include multiple artifacts in preparation for maven
Added maven support.

The buildscript requires the developer to have ossrhUsername and ossrhPassword defined in the global gradle.properties file per http://central.sonatype.org/pages/gradle.html#credentials.
Added missing gradlew file

per @JLBShecky
Merge remote-tracking branch 'upstream/develop' into develop
Preserve compatibility with older Forestry API