custom_forms: return to profile main page when cancelling submission

AI2870
Merge commit 'refs/merge-requests/407' of git://gitorious.org/noosfero/noosfero into merge-requests/407
Fix: updated db/schema
Merge branch 'stable' of https://gitlab.com/noosfero/noosfero into stable
application-helper: refactor gravatar logic
Do not duplicate filters for plugins
Do not build view_paths on each request

Add plugin view paths at initialization.
Calling prepend_view_path on each request is too slow.

Do not include theme dir at view path.
Themes must use theme_include method to render rhtml files (instead of using render directly).
This avoids conflict of files with same name at different themes and reduces the amount of paths in view_paths.
pending-tasks-counter: add css preference

Also increasing margin by 1px.
Bumping version 0.45.1
Updating AUTHORS file
Merge tag '0.45.1' into escambo