Merge pull request #34 from onurv12/master

Fix issue #33
Implement Asset Management

User story will come...
Merge remote-tracking branch 'upstream/master'
Allow projects without users

A project can exist without users.
Improve SQL File
Template for installation process
Fix sql
Merge pull request #36 from tobiasmuecksch/master

Implement Assetmanagement
Implement deleting of users
Add changing of username and full name