v0.9.4

Parser

• Smileys should cause parse errors less often.

Unity integration:

• Added a method for loading Yarn code from a string.
• Remove use of 'WaitUntil', which created a dependency on Unity 5.3.2.
• Added a way to stop dialogue from Unity.
• Added a way to check if a node exists or not.
• Added a way to reset the DialogueRunner.