Adds user feedback to PreferencesPanel.
Fixes typo.
Adds focus event listener to entry text box. Email submitted message will disapear when user renters the box.
Adds timeout to email submission success message. Message no longer displays indefinitely.
Adds title to panel.
Adds document listener to text field. Removes focus listener as its now redundant.
Adds live validation and toggle of error messages and submit button using document listener.
Refactors submit button removing redundant email address validity check, and uneeded vars.
Adds custom email validation, built in validation had bugs.
Don't auto select the 0 card
Improve the styling of the website
Disable vote button when the vote is invalid
Change styling of session panel
Fix color of card border
Merge pull request #280 from TheTeam8s/bug-website

Bug website
Remove duplicate users and correct styling of success message for deck votes
Merge pull request #281 from TheTeam8s/bug-website

Remove duplicate users and correct styling of success message for deck votes
Changes 'closed' sessions into 'archived' sessions in the overviewTreePanel
Filters out requirements in other sessions
Add test for requirement selection panel. Puts requirement selection
panel in planningpoker.view.requirementselection.