First step in two-part process to rename directories to kallithea.
This first step is to change all references in the files where they refer
to the old directory name.

synced vcs with upstream

- moved subprocessio module to VCS
- many small changes to make embedded vcs as similar to to external lib
- use only absolute imports
- patch vcs config during load pylons env

orginized test module
- separated test models into separate files
- added scripts for script tests
- few fixes and renames for readability

Initial version of landing revisions ref #483
- fixed relevant tests for creation of repo
- added some tests for git

Added vcs testsuite for better integration tests + added fetching
of two new repos into test env for rhodecode