Added Visual Functionality for sound Modifiers

Added various icons to make the UI look better, added a button to open
the SoundModifier div.
Added functionality to push and pop sound modifiers into a stack.
Added Function Modifier Modules

Added the mod select and functional modifier modules with the proper
sliders that they take. The mods are identified by the id 'mod-#' with
'#" being the child number in the dom. The type can be accessed by
reading the title or by using jquery to access the type data attr
$("#mod-1").data('type').
Update homeCalDevTest.html
Sound Filters work now

Be careful about modifying the "Q" value on lowpass and highpass
filters.  I about blew my eardrums out when high-pitch sounds got
decibel boosted by 500 db.  I've lowered the max down to 100, but it can
still give a nasty headache.
Merge remote-tracking branch 'origin/dev' into gh-pages