Add new step on wizard.
Add wizard_dialog_base.py to Makefile and compile it.
Change object name.
Set max value and step of combo box.
Almost done, needs codes for behaviour.
Add behaviour for wizard.
Pep8.
Elderly to elder.
Merge with origin/develop.
Add description for units.
for #980
Merge with inasafe/develop.
Add translations for #959. Verified that the translations appear in UI.
For tooltip on source stepd due to #961.
Change classes for the impact layer.
Improvement on creating class.
Fix typo.
Tim's review.
Fix typo.
Fix tooltips.