[views+route+ctrl] Add about page
[views] template: Add Adrian and Andrey to the Authors
Merge pull request #107 from gicmo/aboutPage

Add about page

nice
[service] Conference::get(id) id can also be the short name now
[view] template: use conference.short as link to conference
[ctrl] Application: redirect to first conference using conf.short
GCAAuth: getUserStore: make more scalaesce
[views] login: provide proper 'active'-String to template
[views] register: provide proper 'active'-String to template

Also rename Sign Up to Register
[views] registerDetails: provide proper 'active'-Str. to template
[views] imprint, contact: Don't require a conference

imprint and contact views are conference independent.
[views] If there is no Conference obj, use active as Nav elment

Also if the active element is Register or Login, don't show the
login menu.
[views] conference: Rename Sign Up to Register (be consistent)
[views] dashboard/user: rename active-String to "Abstracts"
Merge pull request #108 from gicmo/confShortIdNav

Use conference short name for navigation/urls

LGTM
Merge pull request #109 from gicmo/cleanUpNav

Clean up navigation links

OK
sbt: add postgres driver
Abstract: set some text size limits

- set text length limit on model to 2500
- set text length limit in editor to 2000
- set acknowledgements limit in editor to 200
- set other text input limits in editor to 100
Serializer: fix bug with disappearing author mail

- 'mail' was serialized as 'email'
editor: figures can now be deleted