Merge pull request #1 from avsej/master

New post: Using Couchbase Ruby Gem with EventMachine
Minor fixes
Do not render meta explicitly
Add link to contributing guide
Environment variables in Rails
Merge pull request #2 from ka8725/master

Environment variables in Rails
Fix remarks in the latest post:

* remove JS/setup
* add new line in the bottom of the page
* add cut
Merge pull request #3 from ka8725/master

Fix small bugs in the latest post
Fix issues after #2 and #3. Update CONTRIBUTING with cutting instructions