Getgauge

Bug Fixes

- 11 - before_step, after_step execution hooks do not work (gauge 0.9.0, gauge-python 0.2.0)

- Removing support for `python3.1` and `python3.2`.
- Updating `proto2` to `proto3`.

- Adding `STEP_IMPL_DIR` property to change default `step_impl` dir.
- Improving console reporting.

- Updated `Table.__str__()` to return markdown format table.
- 8 - Fixing loading step implementation logic.
- Enhance `continue_on_failure` feature, refer [docs](http://gauge-python.readthedocs.io/en/latest/features.html#continue-on-failure) for more info.

7 - Provide a mechanism where users can specify the python version which will be used to run the specs

- Added python 2 support
- Enhanced refactoring
- Setting working dir to gauge project root during execution