Add HTTP proxy support to speed up functional tests
Upgrade default Node.js version to 0.10.0
Upgrade default Redis version to 2.6.11
Fix some unescaped backslashes in non-raw strings
Clean up imports

- avoid wildcard imports
- avoid cyclic imports
- remove unused imports
Use `is` instead of `==` when comparing with `None`
Formatting fixes
Remove dead code

Should have been removed by 02f587e1b95308b6
Reformat and fix bad dict nesting in RPM module
Fix broken OpenVZ functional test
Upgrade default Oracle JDK version to 7u17-b02
Switch back to `env.host_string` in vagrant task [#58, #89]