Fixes #675 

* Made time format configurable

* Made changes to values of time_format

* Removed user restrictions on time format

* Added documentation for time-format config

* Edited changes.md

* Edited config doc

* Modified time-format explanation

* Added link to moment

* Added test to check rendered time

* Edited CHANGES and removeunncessary lines from time format checking spec

* Removed unncessary spaces