Bump Rails version to 4.1.0

Fix spec (requests/admin/posts_spec.rb:45) that fails on sqlite
by explictly ordering tags by id
Revise rails version dependency to 4.0.4 and up
Fix ruby 1.9.3 mb_chars downcase bug
Merge pull request #192 from novemberkilo/master

Update rails version to 4.1.0
Merge pull request #194 from xvonabur/193_mbchars

https://github.com/jipiboily/monologue/pull/192
The bcrypt-ruby gem has been renamed to bcrypt

Reference: https://github.com/codahale/bcrypt-ruby/pull/86
Merge pull request #195 from JuanitoFatas/patch-1

The bcrypt-ruby gem has been renamed to bcrypt.
Add missed mb_chars.to_s to TagController (1.9.3 compatibility)
Merge with 193_mbchars