Default to empty config

Otherwise, certainly situations will cause a silent error.

Specifically, this allows you to use `svg -f` without a config file.
expose jsAPI as factory method
Replaced deprecated ing of yml file #245
Merge pull request #236 from hughsk/patch-1

Default to empty config
Merge pull request #238 from mistakster/create-item

Expose JSAPI as a factory method
Merge pull request #248 from normanrz/master

Replaced deprecated requireing of yml file
added removeDesc plugin
Merge pull request #252 from dwabyick/feature/remove-desc

Fixes #251 - Adds removeDesc plugin
updated local svgo