Added post report feature

You can report a single post by clicking the correct icon in the controler section

Workflow:
* Report a post as offensive
* Trigger alerts to every pod-admin
* Pod-admin can review it in the admin interface
* Delete the post or mark it as reviewed
Absolute path added for favicon.ico
Merge pull request #4700 from qmaruf/absolute-path-for-favicon-ico

Absolute path added for favicon.ico
bump recommended rubygems version
Merge branch 'develop' of github.com:diaspora/diaspora into develop
updated 158 locale files [ci skip]
Add gems upgrade in the changelog
Merge pull request #4709 from Flaburgan/update-changelog-gems

Add gems upgrade in the changelog
bump to 0.3.0.0
Merge branch 'release/0.3.0.0' into develop
start new development cycle
Switched to using rails-timeago to make keeping on top of new versions of plugin easier
Merge pull request #4281 from Ruxton/feature/use_rails_timeago_gem_instead_of_vendored_js

Switched to using rails-timeago to make keeping on top of new versions o...
Merge pull request #4517 from Zauberstuhl/report_post_feature

Added post reporter feature

Conflicts:
	Changelog.md
	app/assets/stylesheets/application.css.sass
	db/schema.rb
Moves rails-timeago into the root of Gemfile, it's used in views + assets
Merge pull request #4712 from Ruxton/feature/move_timeago_outside_of_assets_group

Moves rails-timeago into the root of Gemfile, it's used in views + assets
fix regression in conversations causing an infinite recursion (fix #4715)