Put reverie icons in ImageOptim for lossless image compression.

Getting my feet wet with pull requests on Github here and this is a simple change. I threw all of your icons into ImageOptim and saved the repo 43.9KB, 15.2% per file on average (up to 44.5%). Sometimes it is the little things in life. =) Anyway feel free to merge or ignore, I am more confident in Forking and Pull Requesting today so I am thankful for that. =D

Screenshot @ http://grab.by/oEd0 (didn't know you could add one in the Pull Request, noted for next time)

Cheers,
Frank