Fix minor typo

Changed  to
Merge pull request #1952 from metalivedev/1909-cherrypick

Fix minor typo
Merge pull request #1901 from jalateras/update-contributring-docs

Fix #1664
Merge pull request #1932 from jcassee/patch-1

Download Ubuntu 13.04 repository key over HTTPS
Merge pull request #1929 from tianon/gentoo-docs

Simplified Gentoo install instructions now that our overlay is in the official layman repositories.xml list
Merge pull request #1954 from metalivedev/1901-cherrypick-builddocker

1901 1929 1932 cherrypick to release and docs
Bump to version v0.6.3
Merge pull request #1972 from dotcloud/bump_0.6.3

Bump to version v0.6.3
Merge branch 'release'
Update VERSION to 0.6.3-dev