Now, __storm_pre_flush__ is implemented. For now, we traverse the columns and
we set whatever column that is NOT NULL (allow_none=False) and does not have a default
to None. By doing this, storm raises a NoneError immediately.

This solves #28
Updated models documentation.
Merge pull request #31 from nicholasamorim/not_null

NoneError is raised prior to insert in database, resolves #28.
PYM-5 #close Fixed on pull request #31
README.md updated
Now supporting ordered fields. This is only supposed to run together with branch 'creation_counter' of mamba-storm.
Removed storm monkeypatching from Mamba. Sovles #28 and PYM-9.
Merge pull request #33 from nicholasamorim/field_ordering

Added support for ordered fields in the SQL schema generation. Resolves #32 and #34, and #close PYM-9 and PYM-8

    * Added __new__ method in mamba.model.Model class that remember and uses the definition order of the mdoel properties so we can use it to generate ordered schemas
    * Removed monkeypatchs from mamba code related with storm and implemented them in native way on mamba-storm
fix requirements.txt file to reflect the need to install mamba-storm and not regular storm
read as a classmethod
No need for kwargs
Renamed self to obj.
Added tests.
Merge pull request #37 from nicholasamorim/read_classmethod_take2

Make read method available bound or unbound. Resolve #35, #close PYM-12
Removed Transactor in favor of transact decorator.
Merge pull request #39 from nicholasamorim/standardize_model_methods

Removed Transactor in favor of transact decorator. Resolves #38, #close PYM-13
Setup script updated to get storm from PyMamba/mamba-storm fork instead of the original storm package form PyPy. Fixes #42, #close PYM-14
Merge pull request #43 from DamnWidget/setup_script_fix

Setup script updated to get storm from PyMamba/mamba-storm fork instead ...
Update README.md
Update README.md
Global model behaviour now implemented.