Fix reference to file_path
Ensure branches is not falsy before iterating

`branches` could return None which would error on iteration.
Open delimited files in universal newline mode
Change query that fetches postgres schemas

Not sure what the underlying difference here is, but this correctly
returned the public schema where as the information_schema.schemata table
did not.

Fix #8
Refactor neo4j export to take any type of node

Previously the origin was required as the entry point, but now a branch
or element can be passed an it will correctly export the origin and sources
relative to the node.
Fix wrong label attribute name on oracle.Database