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