Web-based image uploader for OpenDroneMap

Based on the tutorial at coligo

Now triggers an ODM run on each set of uploaded images.

Currently requires environment variables to be set up before starting:

export PYTHONPATH=$PYTHONPATH:path-to-ODM/SuperBuild/install/lib/python2.7/dist-packages:path-to-ODM/SuperBuild/src/opensfm
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:path-to-ODM/SuperBuild/install/lib

This requirement will be fixed in the next update.