* Added uniq.js, need to add tests

* Added basic tests for uniq.js

* Implemented uniq and added tests

* Generated docs for uniq

* Fixed lint error

* Added suport for -c and -d to uniq

* Generated docs

* Fixed formatting errors. Uniq now correctly returns empty string when output is specified

* Added uniq to piped methods

* Improved comment legibility

* Cleaned up the pipeline

* Added pipe test for uniq

* Converted uniq pipe test file to use linux line endings

* Fixed linting errors

* Added recurs. mkdir dirname() failure check.

Prevents an infinite loop with malformed UNCs and/or permission problems.

* Now call common.error() instead of throwing (mkdir).

* refactor: clean up style

* fix: mkdir for invalid perms does not kill process

* Re-throw exception in case it isn't `EACCES`

If a plugin was imported before the ShellJS instance was created, the program
would crash (common.register wouldn't be instantiated yet). Now plugins can be
imported either before or after the ShellJS instance is created.

* refactor: move option parsing into common.wrap()

* docs: update README

#481)