Removes weather forecast alias; rarely used and API is being deprecated
Merge branch 'master' of https://github.com/mwalters/mswdotfiles
Changes install script to be a little more intelligent

Only attempt to rename files being replaced to their backup counterparts if they actually exist.  When renaming, do so safely.
Formats .bowerrc differently
Removes "sl" alias
Improves inline comments
Changes formatting of prompt.sh
Changes git commit alias; adds git diff alias