Adding new .rst file, missing screenshots, and some minor editing

Adding Unit 1: Collecting Spatial Data using OSM Beginner Level rst
files. Removing toolkit (still need to be fixed, table still messed
up). Minor edit of curriculum.rst (still need to be fixed for the table)
Adding 2 last chapter for unit 1 (beginner osm)
Fixing image path and start adding osm intermediate materials
Merge pull request #67 from emirhartato/master

Adding new .rst file, missing screenshots, and some minor editing