Renamed some files. Removed lighten and darken.

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).
Made convolutions tileable, added test for tweening hue shift.
Made convolution filters tweenable.

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...
Cleaned convolve pack, separated filter tests.

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`.
Improved performance of convolution filters.

Previously, I would work with a regular array and compute/store/copy
to/from that array. It should be faster to create an imageData object,
create the convolution result in that object and finally:
`context.putImageData(result)`.
Fixed broken filters. Improved documentation comments.

I tried to use imageData to speed up the transfer of pixel data. The
modified image would appear "behind" (ie obscured by) the original. I
manually copy the array of pixel data.
resolving conflicts
resolved some more merge issues