make code climate a bit happier
minor refactoring
Extract methods to improve flog score of TopicView
Generate avatars with transparent background

Generate avatars with transparent background (for .png images) or with white background (for others).
FIX: New avatar regression with mixed case email addresses.
only the host part of an email address is case insensitive
Replace Clockwork with Sidetiq
Add ScreenedUrl. Rename BlockedEmail to ScreenedEmail.
Merge pull request #1330 from ZogStriP/emails-can-be-mixed-case

only the host part of an email address is case insensitive
Finish renaming blocked emails to screen emails
Merge pull request #1328 from abbat/patch-1

Generate avatars with transparent background
FIX: performance regression on activity streams
Merge pull request #1317 from novemberkilo/master

Extract methods to improve flog score of TopicView
Merge pull request #1309 from stephankaag/sidetiq

Replace Clockwork with Sidetiq
Merge pull request #1331 from ZogStriP/fix-avatars-on-activity-stream

FIX: performance regression on activity streams
Fix url not to be nil
extract method
Refactoring the feature_topic_users method to improve
the code climate score.
removing Guardfile, we no longer use is and rake autospec covers everything it used to do.
use sigterm as opposed to hup, cause spork was not handling the hup correctly