Log any time a child node is skipped because it has already been written
Ignore .txt and .json files
Clarify variable name
Isolated two nodes that caused infinite recursion loops
Use a more minimal schema for MongoDB

Does not use nested documents
Merge branch 'test_no_objects' into fix/narrower
Merge branch 'fix/narrower'
Merge branch 'spare_mongo_import'

Conflicts:
	process/hierarchy.rb