JS-based build.gradle parser

[rarkins]

Example files:

• https://github.com/Jasig/uPortal/blob/master/build.gradle
• https://github.com/Jasig/NotificationPortlet/blob/master/build.gradle
• https://github.com/bagage/gradle-template/blob/master/build.gradle
• https://github.com/bagage/gradle-template/blob/master/module1/build.gradle
• https://github.com/apereo/cas/blob/master/build.gradle

[viceice]

Isn't this a duplicate of #3608