resolve #26

fix a correct docstring of queryset
Fix 18

Fix the name of test function
resolve 26

Start a setuo of test manager
resolve #26

Add a validation in type of parameter of acronym method
resolve #20

Save a field acronym in uppercase
resolve #20

Fix a correct field in filter dict
resolve #20

Set a field acronym to a unique field
resolve #20

Change the manager to get a object not a list of objects
resolve #20

Create a two tests in manager

1. Create test if the queryset raises a error when a paramenter is an
inger type

2. Create a test if the manager acronym get a correct object