Minor cleanups
Move all email code out of the models
Use https to fetch gem data
Revert secret token to default
Include tip on how to add single and multi-word tags to posts

Clearly detail how to properly separate multiple tags on a post
by the use of commas. Follows convention mentioned in help section
of SEO::Titles.

If a user needs to add multi-word tag, then it should also tell
them how to do so by use of double quotes. Otherwise they may
not expect to see it broken up into individual words as spaces
also can separate tags.
Merge pull request #144 from randomecho/article-tagging

Include tip on how to add single and multi-word tags to posts
Merge pull request #143 from Flameeyes/master

Small fixes
Extract secure token generation to a service object
Clean up admin/tags_controller spec
Use generic template logic for grouping template overriding
admin/feedback: make sure that "Mark checked item as (Ham|Spam)" do what they say.

The behaviour of these was to just toggle the state, now they are
actually marking them as ham/spam so that they don't misbehave.