crypto: basic crypto functions
crypto - second draft, including suggested changes
crypto: basic crypto functions
crypto - thrid draft
Docstring and test cleanup for the crypto module
Merge pull request #1 from asmeurer/joyner_crypto

Your patch from https://github.com/sympy/sympy/pull/1854/files#r3310621
Merge remote-tracking branch 'github/crypto' into crypto
Docstring and test and html cleanup for the crypto module
Implemented Morse encoding and decoding
Restricting enciphering only to alphabets and digits
Merge pull request #2 from ankit-maverick/crypto

Implemented Morse code and Restricted enciphering only to alphabets and digits
Minor refactoring
Merge pull request #3 from ankit-maverick/crypto

Minor refactoring
Merge branch 'master' into crypto

Conflicts:
	sympy/__init__.py
Python 3 compatibility and update docstring.

Code updated for Python 3 compatibility and docstrings updated
to match the new printing of Matrix in master after #2088.
Use uniq() from sympy.utilities.iterables.
Update Sphinx docs.
Whitespace fixes.
Docstring formatting and cleanup.
Move imports to the top.