Log how long it to parse the script in debug mode.
Allow passing in a custom parse tree root to libjass.parser.parse()
Parse format-specifier-enabled properties inside parse_assScriptProperty itself instead of relying on caller.
Added ASS.addEvent() to dynamically add dialogues to an ASS object.

Fixes #16
Updated mocha to v1.21.x
Begin v0.9.0
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