README: excluded unnecessary import in the example.
Merge pull request #102 from raninho/master

Excluded unnecessary import in the example of README.
add optional increment_by argument to seq
add documentation for `increment_by` kwarg for `seq`
add doc to demonstrate locally defined recipes
start seq count at increment_by value
clarify reasons for using local recipes
Merge branch 'master' of github.com:vandersonmota/model_mommy into local_recipe_doc
Merge pull request #107 from jsatt/local_recipe_doc

add doc to demonstrate locally defined recipes
Merge pull request #106 from jsatt/seq_increment_by

Seq increment_by