Brought some stuff from the WaveletApps lab over to the Haar lab, since
it is more algorithmic in nature. Fixed small things in the text and
code. Improved the solutions file.
Added new images to the intro to Wavelets lab. Made other smallish changes
to the lab.
Merge pull request #392 from abefrandsen/wavelet

Some additions to the first wavelet lab, taken from the second wavelet lab.