Add gif response on actions (/me)

Whenever an action is seen, the first 3 words
are used as a search string to retrieve a gif
to illustrate how that action looks.
Add help prompt to print bot usage
Fix regex for action matching
Add chat toggle for action gifs
Add enableActions option to CLI
Use screensaver endpoint for wider search base
Update readme with actions and new ?gifme usage
Increment MAJOR version since ?randomgif is removed
Merge pull request #1 from donoftime/actions

Action gifs are added, along with a toggle in chat and CLI option. 

Also removed ?randomgif to instead react on a blank ?gifme. This works nicely with the switch to the screensaver endpoint which returns a random gif if the query is blank.