Fixed intermittent test errors

Fixes #1124

- Updated default mocha timeout to 15 seconds. Any future tests that
depend on a timeout (and thus might be better off with a lower value)
can override the default setting which is now 15 seconds.
- Removed test-specific timeout overrides for the mocha tests.
- Fixed the editor/splitbutton tests to wait for the appropriate
selector instead of assuming the dom has been updated immediately.
Should resolve intermittent timeouts when checking the splitbutton's
applied classes.
clarify ENOENT on npm install for new users
fixed typo in comments of manage.scss

The mage posts screen is probably supposed to be the manage posts screen.
Improved test coverage of theme helpers.

refs #246
Merge pull request #1138 from LegitTalon/patch-1

fixed typo in comments of manage.scss
Merge pull request #1123 from sjama/package.json

fixed license url
Merge pull request #1090 from bnchdrff/user-image-ff-fix

fixes firefox user image disappearance
Fixed further firefox display bugs

See #1090

Conflicts:
	core/client/tpl/settings/user-profile.hbs
Merge pull request #1026 from jenius/master

Remove unneeded info from /user api response
Security improvements

no issue
- added CSRF protection
- changed session handling to express.session
- changed session handling to change session id
- added config property useCookieSession
- added file extension check for /ghost/upload
- removed /ghost/debug/db/reset
Merge pull request #1 from sebgie/security

Security improvements
Remove private data from API

no issue
- added removal to user.browse, posts.read, posts.browse
- fixed removal for user.read
Updating to bookshelf 0.5.7 & knex 0.4.11
Merge pull request #2 from ErisDS/bookshelf-knex-update

Updating to bookshelf 0.5.7 & knex 0.4.11
Merge pull request #4 from sebgie/sec/3

Sec/3
API JSON updates
CSRF for debug screen
Set correct HTTP status code on error

closes #1055
Fixes for content screen

fixes #1125

- fixes an error in the console when there are no posts
- resolves the issue whereby content disappears after scroll
Current user data update