CORE-4817 Added AppsView methods for Belphegor.

Added getAppGroupRoots and getParent methods to AppsView for use in Belphegor for the AppCategorizePresenter.
added IntelliJ Idea files to .gitignore
merge with repo
merge with repo
CORE-4817 Added suggested_groups field to App AutoBean interface.
Merge branch 'master' into STABLE
Versioned as part of Release Candidate for v2.0