Release notes

- Itroduce the social-fabric by implementing the Contacts feature
- Ability to search Contacts
- Ability to click on avatar picture and show Contact Details card
- Ability to mouse-over and avatar and show contact information
- Ability to sign already uploaded DOCX, ODT and PDF files
- Imporved the application speed by optimizing the image handeling

- Fixed a bug with the responsive design  
- Fixed a bug with typo
- Fixed a bug with Austrian phone numbers which are shown as invalid during the registration
- Fixed a bug with Dashboard loading bar