1build

Added
- Show 1build package version using -v or --version
- Create 1build configuration by `1build --init <project_name>
- Changelog draft
- Pull request template

Changed
- Issue template to custom template
- 1build logo to have tagline below

Removed
- Running tests on macOS using Python version 3.6

Fixed
- Missing test for configuration file not found
- Add .pyc in .gitigore
- Running tests on macOS using Python version 3.7

Added
- Introduce python argument parser
- `-h` or `--help` - show help message
- `-l` or `--list` - List all the commands available in current directory configuration `1build.yaml` file.
- [Contribution Guide](https://github.com/gopinath-langote/1build/blob/master/CONTRIBUTING.md) for developers.
- Introduce [changelog](https://github.com/gopinath-langote/1build/blob/master/docs/CHANGELOG.md) for the releases


Changed
- Readme to include Contribution, Versioning, Changelog, Authors, Contributors.
- Readme badges to make center alignment

- Split 1build codebase from one single script to a module with multiple single responsible files
- Switch completely to python 3.5 & higher

- Support for `before` and `after` setup for each command
- Updated description
- `pip install 1build==0.0.4`
- Better logging messages
- Tests in place
- Readme images

- Install `1build` from pip
- Run `1build` with simple project file with commands