Merge pull request OpenDroneMap#1036 from smathermather/master Pull in latest

Merge pull request OpenDroneMap#992 from pierotofy/smimprov Split-merge improvements

Merge pull request OpenDroneMap#978 from pierotofy/clean25dmesh Clean 2.5D mesh, keep vertex count in check

Merge pull request OpenDroneMap#878 from pierotofy/vtkbuild Fix VTK build error for certain environments

Update to version 0.3.1 

Merge pull request OpenDroneMap#567 from dakotabenjamin/03RC-bugfixes 03 rc bugfixes

Merge pull request OpenDroneMap#551 from dakotabenjamin/master Get ready for beta v0.3

Bug fix for 0.2, replaces link to OpenGV 

Merge pull request OpenDroneMap#433 from OpenDroneMap/raw-resize-data Keeps original images pristine in georef

Update README.md