adding new attr - max time unit

adding test scenario, updating docs, updating code.
merge from siddii master
Revert "merge from siddii master"

This reverts commit 54b6788118ef69aeb9e7449dcf783f3d9d16f9cd.
merge with master repo

with conflicts
merging / adding conflicted files
Merge pull request #68 from rajexcited/master

providing Max time Unit feature by attribute
Added handling to allow just setting countdown timer value.

The "timer-set-countdown-seconds" event allows the user to set the value
the countdown timer will start from, without immediately starting the
clock going.
Added a couple of unit tests around new countdown timer setting event.
Merge pull request #69 from creativedrewy/master

Added event handler so users can set countdown timer value dynamically.
`timer-stopped` event returning timeoutId as arg
v1.1.1
v1.1.1