Add title blinking on events

When there is an event, blink the title so that a user can know when an
event happens, even if they aren't on that tab. From discussion in #121
Blink only happens on specified events

Now event objects must have a blink flag if they want to use the title
blink. For starters, this is only global, outside, and room events.
Add variable for blink interval and remove unnecessary type checking

Cleans up global variable that was introduced in favor of a variable in
Events. Removes type checking from conditionals and instead sets
BLINK_INTERVAL variable to false when stopped.
Merge branch 'master' into title-blink
Merge branch 'title-blink'