Add mailing list subscription checkbox on register
add mechanism for implementing supported translations policy
Fix html/style for aggregate table embed

The bottom button bar was obscured. I can see no
reason why this widget would need to be 400px in
height.
Developer docs with db migration instructions

- Created a developer.rst file to put in developer docs.
- Added DB migration instructions.
Make mailing list subscription optional
Refactor mailing list subscription, notify on error
Fix spelling mistake and redudant text per review
Merge pull request #556 from openspending/docs-db-migration

Developer docs with db migration instructions
Update search pagesize limit to 10000
Make CSV download URL a proper link
Refactor dimension nav template, add CSV download
Fix html/style for aggregate table embed

The bottom button bar was obscured. I can see no
reason why this widget would need to be 400px in
height.
Put credit link into bottom right corner of embeds
Remove pagesize limit from search page download URL
Update search page download url with order change
Refactor search Browser to give attributes individually
Remove pagesize limit from search param parser
Implement streaming csv/json response

Takes effect when pagesize is bigger than default
pagesize.
Merge branch 'master' into subscribe-mailinglist-541
Show subscription option only when mailinglist set