Merge pull request #88 from ceci/master

Confirmation date update
Fixing review submission form, and re-enabling duration as a criteria for review
Closes #87: Always include blank option for filtering sessions by track
Progress on #82: making the system an OAuth provider with doorkeeper, and exposing API endpoints for interacting with user
Progress on #82: Adding voting deadline
Progress on #82: Enabling refresh tokens for Oauth and sending vote URL on JSON response
Fixing build (#82)
Closes #89: Show language that session will be presented on review form
Only display early review count if conference has early review phase
Fix #73: Splitting change password from edit profile, and avoiding autocomplete in password field
Ooops, moving default development database to sqlite
Adding help message when users have not voted yet
Adjusting review deadline.
Closes #93: Filtering reviewers by status and by track
Fixing schema.rb to look like sqlite again
Adding filter to reviewer sessions
Closes #95: allowing organizers to filter sessions
Updating a bunch of gems
Replacing filters with around_filter to avoid persisting user-specific state across requests
Progress on #86: email specs with email_spec and refactoring EmailNotifications