initial working commit
changes to gemfile & assets
styling tweaks & included Bootswatch
system messages when users connect & disconnect
converted from HAML to ERB
auto-scrolls when chat's overflow & prevent blank messages from being sent
user count in sidebar updates as users connect/disconnect
user list in sidebar lists users alphabetically after each message
refactoring & readability enhancements in ChatController
WIP: before_filters/observers
merge