Merge pull request #358 from s0undt3ch/develop

Several Lint Fixes
Avoid leaving unnecesary file after boostrap install. pip-python treats the version requirement, ">=", as an output redirection. As a result, a "=0.1.40" file is created when installing libcloud.
Merge pull request #364 from oreh/develop

Avoid leaving unnecessary file after bootstrap install.
Install the Debian keys. Fixes #359.
Also install Debian keyring on Ubuntu.

Just in case.
Stop complaining about `$` needing escape
Add Liu Xiaohui(@oreh) to AUTHORS
Add quotes around `apache-libcloud>=$_LIBCLOUD_MIN_VERSION`
Update ChangeLog
Add the backports key to keyring. Update after installing keyring.