Quotes are configurable

Fixed #23 and #24.

Depth limits

Fixed #22 to add support for --depth

Repeats

Updates to latest Peggy version.

Adds support for "a"|..,", "| construct. Fixes bugs for "foo"i, [a-z]i and [^a].

Add "Decision" class for & and !

Semantic and simple predicates are now represented as stretchable octagons.

Initial release

Base functionality working. File bugs and feature requests!