Bugfixes and refactorings.

Merge branch 'release/v0.1.2'

This release cleans up the lithe core codebase. Some notable changes:
* fixes failing tests where the patch disconnect was occuring when there
were no connections.
* removes testParameterField, and testSink (these were not written, or
were no longer relevant).
* removes sorter parameters from the Node class to adhere to single
responsibility principle.
* refactored sorter to work with the new refactors in Node class.

Remaining issue:
* testToricAtlas still fails. Need to look into the math to ensure that
things are working correctly.