Merge branch 'feature/optional' of https://github.com/VenomVendor/Ded…

…uplicateSMS into feature/optional

* 'feature/optional' of https://github.com/VenomVendor/DeduplicateSMS:
  Added checkbox feature to ignore timestamp if messed up with timezone. Added pluralization. Used correct style. added support for API level 4+
  for next release.
  Show revert dialog, when no duplicates found. Refactored code to meaningful Listener name. Cleaned code. Throw exceptions.
  Fix for Issue#1