Cleanup, add some phpdoc

* Remove unused debug code from DFDiagram.php
* Spacing (DFDiagram.php)
* More comments, docs in Diagram.php
Remove leading zeros from character tags

closes #11
Spacing

Color.php: "=>" -> "=> "
More spacing

Colors.php (color names)
Clean up Grid.php
Spacing, doc formatting updates, add documentation in VarDict.php
Remove unused debug code
Update README.md
Merge branch 'master' into dev

Conflicts:
	Diagram.php