Wrap the params parsing in a DB.open to avoid the enum source having to grab a new connection for every query.
Speed up BatchImport request parsing by caching created dynamic enum values on the request context.
Remove failed attempt at getting Travis to send us screenshots
Add an extra parameter to update_from_json to optionally skip updating linked records.

Useful to avoid the extra overhead if you know they haven't changed.
Bump oldgen allocation a little
Dropped a few stray debugging lines.
Add a sleep before dealing with Firefox's 'navigating away' modal.
Centralise JSON generation and switch off Rails .to_json extras.  Too slow for big documents.
Don't use MultiJson for serializing schemas
Don't request possible enum values unless something goes wrong.
Modify parse_queue to allow the garbage collector to reclaim memory while the save to the backend is still running.
Cap the amount of memory the xml importer's regex_cache can use.
Merge pull request #348 from hudmol/import-performance

Import performance