Pulsar-agile

Backward incompatible version which brings lots of improvements
in the API and internals
- Allow to run all commands, not just tasks
- List commands in alphabetical order
- `vars` and `python` commands always run
- Interactive shell execution with `chdir` parameter
- Refactored github api
- Removed ansible roles

- Added `python` module for executing python function on the same application domain as the app manager [2a6e21a](https://github.com/quantmind/pulsar-agile/commit/2a6e21a04adfadfc1f9ccfbbd67083f0e8aa3ea0)
- Handle release notes when no release is available on github [756bd2c](https://github.com/quantmind/pulsar-agile/commit/756bd2c043519782ff0fd03a4a22b4892ea97f86)
- Added s3 and labels commands and fixes [5](https://github.com/quantmind/pulsar-agile/issues/5)

- Overall refactoring
- THe agile script now executes tasks only
- Agile apps are executed from tasks
- Agile apps can now start servers
- Added Watch server for execuing tasks on file changes

- First official release