Implement variables

* Add VarDict class
* NOTE: Parses out blank lines (workaround: use 1 space for empty line)
* See issue 5
Implement variables

* Add VarDict class
* NOTE: Parses out blank lines (workaround: use 1 space for empty line)
* See issue 5
Change version number to 0.3
Merge branch 'dev' of https://github.com/lethosor/DFDiagram into dev

Conflicts:
	DFDiagram.php