Add the tree_to_json function to the database initialization.
Updated data containing rows for the trees table.
Commit for editor autoformating of SQL files
Fixes the data type mismatch of uuid and text.
Provides the contents of the get-tree-by-uuid-n-version sql query to the application.
Provides the tree content to the view output.
Fixes the test to check for the collection tree.
Use the modules table rather than latest_modules
Revised tree_to_json to match on uuid and version
Merge pull request #11 from Connexions/tree-integration

Tree integration
Expose exports/ to non development environments

Remove dev-mode variable from config file as it was only used for
whether to register the exports/ route.
Return 404 Not Found if export file does not exist
Support multiple export directories in exports api

The exports api will look for a file in any of the export directories
given in the config file.  If the file is not found then it returns 404.
Add allowable types in config file and include it in the api
Set exports filename to <slugified title>.<file extension>
Redirect to latest version if exports url does not have a version