Blowdrycss

Fixed file extension printing error. Now it uses the settings output_extension. Updated unit test.

Enabled support for output file_name and extension customization. Created settings validation utility functions and unit tests. Custom output file examples: _blowdry.scss and custom.css. Added support for Python 3.6.

Incremented to 1.0.0 since the code is stable and working well.
Enabled support for `*.php` extension and added integration tests.

Enabled support for the `*.vue` extension and added integration tests along with a simple test_vue folder. Requirements cleanup.

Performance enhancement during recent/on_modify case. Only build the `css_text` based on new
class selectors created during the most recent modification. Append this to the pre-existing `css_text` then
overwrite `blowdry.css` or `blowdry.min.css`. A new parameter `css_text` was added to `blowdry.parse()` and
to the override for the watchdog event handler. Special test created to verify that the `css_text` is
handled properly.

Added a call to `LimitTimer.reset()` to fix a bug in which the LimitTimer never expired.
Add two more color regexes which allow the case in which hex is be combined with a pseudo class.
e.g. `hffffff-hover` or `hfff-before`.