Add Rails 4 support
Update Readme
Minor code style changes
Revert "Update Readme"

This reverts commit f0db77c2f9d94e6d1078a5c59c6de93a9daeed97.
Merge branch 'rails4-support' into emjot-stable
Update Readme

* add info for current emjot-stable branch, incl. changes
* update installation instructions for emjot-stable branch
* remove old references to other projects