Improved comma tag completion on international keyboard layouts

Reported in issue #1475
- `String.localeCompare` can be more reliable for keys that do not relate to cursor movement
- Adds a third key handler (`keypress`) that contains the character code rather than physical key
- `COMMA` key constant no longer required (unless `,` char should be a constant?)
Add Post Tags to RSS Feed

Issue #1722
Delete all content (posts and tags)

closes #1445
- added delete button to ‚ugly debug tools‘
- added api call to delete all content
- added /db to cache invalidation routes
Merge pull request #1741 from hughes/better-comma-detection

Improved comma tag completion on international keyboard layouts
Merge pull request #1750 from pmgarman/rss

Add Post Tags to RSS Feed
Adds URL back into theme config

fixes #1749

- pass config().url into theme.update
- rename paths functions to match theme function
- adds tests for theme config
- We should probably try to eliminate passing config.url around
Merge pull request #1761 from ErisDS/issue-1749

Adds URL back into theme config
rogue dataprovider
Allows disabling of timestamps when importing posts

fixes #1696

- this is a temp workaround until full fledged support
is added directly to bookshelfjs
- when importing we use the import json blob’s timestamps
as the value that’s set in the DB 
- added tests for this change
Set min-height on user profile cover image

Fixes #1752
Merge pull request #1743 from sebgie/issue#1445

Delete all content (posts and tags)
Adding messaging that deleting is permanent
Path, url and subdir cleanup & test

issue #1754

- remove path (it was only used once, and not needed)
- change webroot to subdir
- add unit tests for config.paths
- various other cleanup
- renamed client-side ghostRoot to subdir
- added url helper for client
Merge pull request #1764 from ErisDS/path-cleanup

Path, url and subdir cleanup & test
Static pages do not use dated permalinks

closes #1753
- Pages are registered to '/:slug/' route if posts are using dated permalinks
Correct ARIA role for pagination helper

Fixes https://github.com/TryGhost/Casper/issues/63
Shared folder asset handling

fixes #1659, fixes #1668

- removed relative asset url from css
- added asset helper to client
- updated references to shared assets
- added functional tests
Merge pull request #1772 from markberger/1753-static-page-url

Static pages do not use dated permalinks
Merge pull request #1769 from ErisDS/shared-assets

Shared folder asset handling
Merge pull request #1759 from hswolff/fix-import-updated-at

Allows disabling of timestamps when importing posts