Giit

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* Major: Drop Python 3.4 support.
* Major: Added support for running scripts without a Git filter.
* Major: Rewrote steps and filters implementation.
* Patch: Fix using checkout in variable reader.
* Patch: Improve logging output.
* Minor: Added verbose flag to produce more logging on stdout
* Patch: Using absolute path for build_path, giit_path and config_path

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* Minor: Added a "clean" step which removes the build folder.
* Major: Support only building remote branches. I.e. you have to
push your local changes to a remote before being able to build.
You can always see your local changes with the workingtree build -
if needed.

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* Minor: Better support build building local branches (which does
not yet exist on the remote).
* Minor: Clone from path if available.
* Minor: Support publish_url for push type steps. This will print
all index.html files pushed.

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* Major: Remove source_branch scope for a more general branch scope
* Minor: Add a branches attribute to allow certain branches to
always run.
* Patch: Add a --clean_build option to remove the build directory
before building.

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* Patch: Add support for writing a .nojekyll file in the push step.

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* Patch: Simplify exception handling logic in PythonCommand.
* Patch: If building from a workingtree (local directory), then
read from config from there.