Fix dir bug that caused redis to fail every write

`dir` config var should be set, and all data is relative to it.

* CF http://redis.io/topics/quickstart
* CF https://github.com/antirez/redis/issues/305
Add support for virtualenv prompt
Merge pull request #113 from vperron/master

Fix redis module DB persistency issue
Add redis persistence test [#113]
Upgrade default Redis version to 2.6.13
Merge pull request #115 from artnez/virtualenv-prompt

Add support for virtualenv --prompt option
Allow relative path in virtualenv context manager
Also set env.user and env.hosts in vagrant context manager
Add task to require git command line tool
Fix Python 2.5 compatibility
Clear shell environment variables before sed/append

Functional tests would break at this point when using an HTTP proxy,
which injects a http_proxy environment variable.
Abort on nginx configuration errors
Upgrade default Node.js version to 0.10.7
Prepare 0.14.0 release
Merge remote-tracking branch 'refs/remotes/ronnix/master'