This makes it possible to create projects witout specifying the customer it should be attached to.
By default the projects without any specified customers are now attahced to the "Internal" customer.
https://github.com/ari/jobsworth/issues/447
http://squish.ish.com.au/tasks/20013
Using current_user.company.internal_customer instead of finding the
internal customer using Company.where(:name =>"Internal")
The test cases have been added in this commit
Constant used in test cases removed in this commit.
Merge pull request #490 from ari/viks-cannot-create-projects-without-customer

Viks cannot create projects without customer