Code standards cleanups
Improvements based on code review from @akbargumbira
[FEATURE] Inasafe Wizard for keyword creation
Wizard docstrings fixes according to PEP8
Exclude wizard_dialog_base.py from pep8 and pylint checks
Fix translation bug when the source string is empty
More wizard docstrings PEP8 compliancy fixes
Merge pull request #919 from borysiasty/develop

Inasafe Wizard for keywords creation
Merge pull request #924 from timlinux/develop

Code standards cleanups