Revert "Merge pull request #39 from yohoushi/rails4.1.0"

This reverts commit 907537a21f6766ad213a88c5a484357c38a1db78, reversing
changes made to 5f8ae49d491ecd0850157e8c4d9c7c4af9747b14.
Restart serverengine by stop and start combo instead of sending USR1
Make serverengine's memory usage thresh configurable
Merge pull request #41 from yohoushi/restart-mem-usage-limit

Restart serverengine by stop and start combo instead of USR1 signal
Revert "Revert "Merge pull request #39 from yohoushi/rails4.1.0""

This reverts commit f1036494d49e370b760ea963866a371c6cb9ebdf.
bundle update slim-rails
Fix rails version spec ~> 4.1.0
bundle update coffee-rails rails
activerecord-4.1.0 requires mysql2 (~> 0.3.13)
`bundle update rspec-rails  guard-rspec` to fix minitest bug
bundle update bullet

Update it to fix this https://github.com/seattlerb/minitest/issues/286
Make bootstrap_flash helper work with rails 4.1.0
fork acts-as-taggable-on