Django-static-precompiler

- Fix the `run_command` utility function to rely on process return
code rather than stderr to determine if compilation has finished
successfully. WARNING! Changes in `run_command` are backward
incompatible. If you use this function in your custom compiler you
should update your code.

- Add support for `--presets` option in Babel compiler. See babel-cli
[options \<https://babeljs.io/docs/usage/options/\>]{.title-ref} for
more information.

- Fix Stylus compiler to actually enable support for detecting changes
in imported files
- Add `precision` option to SASS / SCSS / LibSass compilers. Set it to
8 or more if you compile Bootstrap.
- Add `output_style` option to SASS / SCSS / LibSass compilers.
- Enable verbose output for `compilestatic` management command

- Add LiveScript compiler
- Add support for `--global-var` option in LESS compiler
- Add SCSS / SASS compiler based on Libsass

- Add source maps support for SASS/SCSS
- Add source maps support for LESS
- Add source maps support for CoffeeScript
- Add source maps support for Stylus
- Add source maps support for Babel
- Add [Handlebars](http://handlebarsjs.com/) compiler
- Add support for Django 1.9
- Add `plugins` parameter to Babel compiler
- Add `load_paths` parameter to SASS/SCSS compilers

- Add `modules` parameter to Babel compiler
- Allow to install Watchdog with
`pip install django-static-precompiler[watch]`