Added 2.6.0 Release Notes
Fixed formatting (fixup)
Removed redundant issue tags (fixup)
CDAP-551-PurchaseAppUserProfiles
Updated PurchaseApp with user profile service and test case.
Removed extra line.
Added Sasha's updates (fixup)
Updated documentation to add information about UserProfile service.
Updated code to incorporate review comments.
Deleted unused class.
Fixed styling issues.
Removed redundant condition.
Fixed as per comments.
Removed redundant null assignment.
Updated and rearranged.
Change to make Bug Fixes like the earlier versions
fixed typo
Merge branch 'release/2.6.0' into feature/2.6.0-release-notes
Add ref to FileSets docs so they can be linked; added link to release notes; fixed links in release notes.
Added release note about upgrading cluster and loss of messages (CDAP-745)