unlink dropbox when a user cancels
added example session invalidation code
added modules folder
Improve file uploader CSS
if its a custom account redirect to /user/subscription/custom_account
added custom user dashboard page
Merge branch 'master' of https://github.com/sharelatex/web-sharelatex
added customAccount to subscription model
added geoip lookup feature
use first ip passed though in string for ip lookup
default to USD in geo ip lookup.

Decided to put default logic in the GeoIpLookup.getCurrencyCode as
we are going to want this default everywhere we use it.
add 1 second timeout to geoiplookup

response times generally seem to be around 0.05s from our servers
Fix alignment in left menu
Add in compile timeout and group feature options
Add github feature flag to user model
Merge remote-tracking branch 'upstream/master' into ldap-auth