pep8 for tests
reformat references and examples
Cleanup imports
Remove an arbitrary convergents restriction
continued_fraction_rational_number -> continued_fraction_iterator
continued_fraction_periodic() to handle quadratic irrational numbers
Remove continued_fraction, add tests
Add sympy.ntheory.continued_fraction to sphinx docs
Add exports for continued_fraction* to sympy.ntheory
Remove continued_fraction implementation from physics module
Merge pull request #1 from skirpichev/continued_fractions-dammina

Continued fractions for dammina