I removed the ability to do a convolution with a 1D matrix because I was
using all 2D matrices. I also cleaned up some unused variables and filters.
I took the entire group of tests dealing with image filters and put them
into `filterTests.html` and `filterTests.js`. I removed them from
`visualTests.js`.
Unsharp mask, soft blur, sharpen, emboss, edge detect are now "tweenable";
however, I think I need to tweak the convolution matricies. At 0 there
should be no effect applied which corresponds to a matrix with just a
`1` in the middle (ie [...1...]). If the `filterAmount` is small then
the matrix is all near 0's causing the image to 'flash black'. If I always
add a 1 in the middle then the images become too bright...
Renamed Colors.js to ColorPack.js and Colvolution.js to ConvolvePack.js.
Also removed convolution based 'lighten' and 'darken' (from the code
and the tests).
