There are some redundancies in the validation steps, and that is to
preserve current error messages behavior

Also few specs have to be changed in order to fix madness in validation
logic.

This reverts commit cb10b725c8929b8b4460f89c9d96c773af39ba6b.

This reverts commit 13e37a3e.

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

Also removes the note from the development/testing.md guide