* Lossless image optimization (using ImageOptim).
This shouldn't change the visual appearance of any images. ImageOptim
was run with the highest compression setting except that JPEG metadata
stripping was disabled because some users prefer to avoid stripping
JPEG metadata.
* Update READMEs that have Changelogs for themes impacted by lossless image optmization change.
* Adding theme Didone from @beafialho
* Slight adjustments to patterns; Removed unused comments pattern, started using (and made ajustments to match templates) footer and no results patterns
