Updated styles for error messages
Will remove scaffolding CSS soon
Update Gemfile to use parse-cron from git instead of Ruby Gems

Wanted to piggyback off of validation methods for parse-cron;
they haven't been released as a gem yet, so git it is.

Also added the valid_email gem, for an easy email validator.
Add names for routes
Update layouts and views beyond "yeah, this sort of works"
Added custom validators and fixed scheduling math

Job#late? had a bug, where if you were in the middle of
particularly short schedules then the length of time
it computed for each interval wound up being 2x the actual
duration between scheduled runs. This has been fixed.

The Job model also recieved new validators, which loosely
verify that URLs don't overlap with controllers and that cron
schedules at least sort of look valid.

A validator was also added to loosely verify that email addresses
sort of look valid.