Add @brian-armstrong's 'quiet-js' project to better projects list

Adds links to robust projects that can do the same thing (better.)

Removes extra line.

Merge pull request #31 from tevino/master

Use raw_input when running in Python2

Fixes python 2 style print statement.

Allow using input instead of raw_input in python 2.x.

Merge pull request #26 from richo/master

Add an __init__.py

Fixes comment on why freq was chosen, as tialaramex noted it made no sense.

Adds note about also being annoying to some humans.

Updates options use a chunk size of 256 and a frame_length of 3. This makes things a bit faster and still seemed to work well.

Fixes Issue #12, where checking around a frequency that is very close to the edge of the fft would cause an index out of bounds. Also makes checking around around a frequency a little more robust.

Adds notes about why a frequency around 19kHz was chosen.

Fixes audible squawking by not having any jumps in phase. Also cleans up envelope function.