Merge pull request #61 from mikesname/user_activity

Expose a web service method to fetch user activity.
Merge pull request #62 from mikesname/rest_paging

Changes to how paging is handled on the web service
Merge pull request #63 from mikesname/ws_export

Add a web service admin endpoint for exporting the DB as GraphSON
Merge branch 'master' of github.com:EHRI/ehri-rest