Check resource.source_file.kind in _should_parse_resource instead of
every time the latter is called.

* less   -> css
* git    -> vcs
* uglify -> js

*   Remove `hyde.fs` use `fswrap` package instead.
*   Remove logging functions from `hyde.util`. Use `commando.util`
    instead.
*   Remove `hyde.loader`. Use `commando.util.load_python_object`
    instead.

Added import-path= option
  - Allow user to define import paths for less compiler
Improved resource handling
  - Do not replace imports if resource uses_template option is False
  - Skip resources with `parse` meta option set to False (helpful to
    avoid parsing of helper less lib files)

This is very handy in Unix world as most applications have standard
installation paths and standard command-line names. Hence, we can now
use those plugins without altering the site.yaml file at all.