#308 small changes to logged messages and exception handling
#308 adding message in log about the code of nonexistent entity in db
Merge pull request #310 from OCHA-DAP/small-changes-to-messages

Pull req: #308 small changes to logged messages and exception handling
Changing version number to 0.5.1
Merge pull request #311 from OCHA-DAP/dev

Pull request: for merging 0.5.1 from dev to master
#309 update modified values
Include the unit in the API responses #313
Changing version number to 0.5.6
Merge pull request #314 from OCHA-DAP/dev

Pull request for merging dev into master for version 0.5.6
Merge branch 'master' of https://github.com/OCHA-DAP/DAP-System into push_to_ckan_298