set up constructor function to handle multiple filters
got rid of default volume, setup the setup filters on play
setting up filters for the microphone
removed unneccesary else clause
refactored construcotr
filter setuponplay now handles filter: {} arguments passed to play()
added isArray() helper
fixed mic filter thing and deleted comments and fixed typo
added iterator to filterEnv
Merge pull request #10 from coleww/add-multiple-filters

Add multiple filters