add test to calculate stat for Data
add basic feature transformation
check whether features are intersected in Data.__init__ rather than at __add__ step
update Data init
move feature transformators to feature class
update test for features, add datatypes - strings.
update getitem functionality after change Data.objects from matrix to array
add competitor description to README
init documentation for project
update gitignore
update css for documentation (use Werkzeug and Matplotlib), init getting_started guide.
add link to readthedocs documentation to README
remove commented line
update equality check
update __eq__ method for Data
use len features as dimension for objects
update getitem for data
update tests, fix slice
update __add__operation. Add matrix creation.
use nobjects and nfeatures for Data