Add blinking curser

The : now blinks like a real digital clock
Removing folder
Fix code logic

Cleaning up code logic
(maint) Add blink colon option

Prior to this commit, my blinking colon pull req made blinking default.
This commit makes it so that you have to pass in a flag -B to make the
colons blink. This fits with the style of this program.
More up to date readme

The readme was out of date from what was reflected in the code.
Merge pull request #14 from briancain/master

Adding Blinking Colon