Add: Sequential module
Add: Sequential module

This module now contains all previous functionality plus a generic
sequential function runner. All functions in this module queue only
one function on the event loop at a time.

This module should be useful turning sync loops into async loops
for better concurrency management.

Signed-off-by: Kevin Conway <3473c1f185ca03eadc40ad288d84425b54fd7d57@gmail.com>

kevinconway/Loop.js,kevinconway/Loop.js