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
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