Changelog:
- Moved string colorization to lib/color.rb
- Moved constants to lib/const.rb
- Moved sudo checking before docopt checking.
- Changed docopt require to be relative
- Fixed stray tabs

Should be on CREW_PREFIX

The `${VAR:-/some/path}` will use the path on the right side if the variable on the left side is null or empty (ie if the user didn't set it).

miniupnpc is a lightweight upnp client library. Added as a prereq for bitcoin.

Tested as working on XE500C13-K01US.

shhopt contains C-functions for parsing command line options.

Tested as working on XE500C13-K01US.

Shhmsg is a collection of C-functions for error messages, verbose messages and
`normal' messages in terminalbased programs.

Tested as working on XE500C13-K01US. Added as a dependency for `banner`.

Scheme48 is a Scheme byte-code interpreter.

Tested as working on XE500C13-K01US.

Also changed the homepage to a more relevant one.

Update to make chromebrew work on Google OnHub.

This is a general bugfix and maintenance release.

Tested as working on XE500C13-K01US.

Update geos from 3.6.1 to 3.6.2

Update screenfetch from 3.7.0 to 3.8.0

This is a general bugfix and maintenance release.

Tested as working on XE500C13-K01US.

This is a general maintenance and bugfix release.

Tested as working on XE500C13-K01US.

Change nano.rb to add dependency for filecmd.