Add missing tests

[WendelHime]

Reopened because coveralls find files which need to be fixed

• [x] DiseaseController.py
• [x] ImageController.py
• [x] TextController.py
• [x] UserController.py
• [x] restplus.py
• [X] BaseController.py
• [X] PlantController.py
• [x] TypeController.py

This badge should be at 98% at least:

[WendelHime]

closed with #80