optimized GeometryInputFormat
Implemented the 2nd version of Gridify. It should now run in approximately n log n instead of n**2
Remove a non-neccessary import in Gridify
Bugfixes + test case for GeometryInputFormat
fixed several bugs
merged prze
Merge remote-tracking branch 'remotes/teots/master'
Merge https://github.com/schernic/stratosphere-workshop-template
Enabled the Grid to work with envelops directly.
Merge remote-tracking branch 'remotes/teots/master'
fixed bugs