Merge pull request #1018 from assefay/inasafe

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Show green rubber band representing what the next analysis extent will be.
Merge remote-tracking branch 'origin/develop' into develop
Added button to toggle rubber bands. Needs translation!
Fix for rubber band not showing on first load of QGIS
Resolved merge conflict
Resolved merge conflicts
Merge pull request #1020 from timlinux/develop

Show extent preview for next analysis so you can see what effective coverage you have