Rewriting the SampleContentProvider as we want it to be later.
A lot of refactoring.
Removed unused methods.
Minor fixes.
Fixed contract classes changes during tests.
Fixed failing tests using setContractClasses methods.
Removed the @Contract annotation as it is no longer needed.
Minor refactoring.
Added a table builder.
Simplified Contract object.
TableBuilder now supports constraints.
Removed @Unique and @NotNull Annotation as they are no longer needed.
More simple DatabaseField.
Renaming DataBaseHelper.
Refactoring.
Removed ContractHolderList class.
New organisation about models.
Removed Invalid contract exception.
Provide a default implementation of the openHelper method.
Update the fist section of the README.md