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Public API changes:

• Adds XY Pad to synthesis section in demo app.
• Adds update method to Connectable mixin. #30
• Adds withinRange utility which allows one to set a min and max value for a number. 7eae27b
• Filters in Oscillator class now use POJOs for settings instead of separate properties for each filter prop (lowpassFrequency becomes lowpass.frequency). Filter is disabled if corresponding property is falsey, and errors if truthy but not object. #30
• Connectable mixin private _wireConnections is now protected wireConnections to facilitate using Playable/Connectable mixins in classes outside of Ember Audio. f6e2ad4