0.2.2: Acoustic model and acoustic fixes

This release adds compatibility with all (I hope) of the publicly released CMUSphinx models from https://sourceforge.net/projects/cmusphinx/files/Acoustic%20and%20Language%20Models/.

The decode_file method has been fixed to work properly when the sample rate of the file is different from the default.

There are also a number of JavaScript updates, in particular, a major change to switch to float32 input at 44.1kHz by default, as this is the only format provided directly by the WebAudio API.