v0.8.0

Rewrite of dynamic hierarchy code to add implied assignments and various other bug fixes and logic refinements. Also started to add some logging.

Full Changelog

Closed issues:

• Add verbose flag to explain behavior #73
• Allow one variable definition to define others, implicitly #67
• Errors output to stdout instead of stderr #61

Merged pull requests:

• Fixes #73: Add verbose flag #74 (alechenninger)
• Implied variables (fixes #67) #72 (alechenninger)