Add sort function to Transformer.afterParse sources prior to visitation

[derekbar90]

I just added a small change to the Transformer class, specifically to the afterParse method. I added a sorting function to ensure that user scripts are visited last during transformation. This is important because user scripts may reference other scripts in the project, and we want to ensure that those dependencies have been transformed first/all supporting classes encode statements have been populated.

Please let me know if you have any questions or concerns about this change.

[derekbar90]

Fixes: #43

[JairusSW]

I commented in #43