Add purchase history tests

nc-50
Add purchase history factory

nc-50
Implement 'purchase history' models and view

nc-50
Merge branch 'develop' of code.opennodecloud.com:nodeconductor/nodeconductor into feature/nc-50
Rename organization to customer, timezone fix

nc-50
Coding style / code review fixes

NC-50
Fix setUp() separate attributes

nc-50
Add test purchases not allowed for any project

nc-50
Merge branch 'develop' of code.opennodecloud.com:nodeconductor/nodeconductor into feature/nc-50
Add direct purchase access tests

nc-50
Rename Role to ProjectRole

NC-66
Drop Environment

NC-66
Introduce CustomerRole

NC-66
Add api manipulation tests

nc-50
Resolve git merge conflicts

nc-50
Disable LDAP backend by default (NC-75)
Fix LDAP settings templates, open ALLOWED_HOSTS (NC-75)
Include overwritten templates in the egg (NC-75)
Merge branch 'feature/nc-75' into 'develop'

Feature/nc 75
Merge branch 'feature/nc-50' into 'develop'

Feature/nc 50