Git-svn-helpers

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* Refactored the entry points to just use gitify. All other commands are now
sub-commands of ``gitify``:

* ``gs-commit`` has been replaced with ``gitify push``
* ``gs-fetch`` has been replaced with ``gitify fetch``

* Added usage and help output for each command.

* Removed the ``gs-clone`` entry point as it was only ever used together with
the main gitify command anyway.

* Use proper logging instead of just printing to stdout

* Added comprehensive tests, including functional tests that cover the entire
update/commit cycle of cloning an svn repository and commiting back to it.

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* BUGFIX: Don't use custom aliases, as they might not be installed.
This resolves http://github.com/tomster/git-svn-helpers/issuesissue/2
* BUGFIX: Explicitly list elementtree as dependency
This resolves http://github.com/tomster/git-svn-helpers/issuesissue/1)

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* Added the ``gs-commit`` command which helps committing back to svn and
keeping git and svn in sync

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* Added the ``gs-fetch`` command which helps keeping the cache up-to-date

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* BUGFIX: get the svn log from the package root (i.e. ``/path/to/foo``)
instead of the locally checked out path (i.e. ``path/to/foo/branches/bar``)
which is usually much younger than the entire package and thus we would miss
revisions in the cloning process!

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* Initial release a.k.a. "Works for me"