@add:;Added configuration to create a minimum META-INF/MANIFEST.MF file.
@fix:;Exclude the liferay-plugin-package.properties file from the default resources filter.
@add:;Added buildnumber plugin to setup timestamp and git sha1 in the MANIFEST.MF file.
@add:;Added portlets submodule.
@add:;Added share-buttons-portlet.
Merge branch 'feature/add-share-buttons-portlet' into develop