Issue 3289: substitute warnings for print statements
change print to warning. missing import statement
Merge remote-tracking branch 'upstream/master'
fixed warnings statements in pretty_symbology.py
lxml instead of libxml2 for c2p, google app engine supports lxml and generally better supported
empty line made quality test fail
apply_xsl real doctest instead of just usage example
doctest_depends_on added, doctest corrected
tested from within vim line-by-line over more files and missed import line in this file
Make isympy importable in Python 3

That way, if someone runs python3 bin/isympy, they will get the "this is the
Python 2 version of SymPy" error message instead of a SyntaxError.
Drop str() printers for factorial/subfactorial/etc (issue 3781)
Fix tests for factorial printing (issue 3781)
Fix docstring tests for factorial printing (issue 3781)
Change signs in test for issue 2934
Sort output of dotprint according to args ordering

This makes the output to the dotfile use this ordering (previously it used
len), and also adds the ordering="out" flag to the file (see
http://stackoverflow.com/a/9216782/161801).

I didn't add a way to change the ordering.  The previous one, len, would
roughly order the nodes from biggest to smallest, but not exactly, since it
was a len on the string rather than a len on the nodes.
Some updates/cleanups to the README
2695: Pretty print of -x/y

Implemented one possible solution: Shift denominator one character
to the right when certain conditions apply:
- Numerator is negative,
- Numerator is even width,
- Numerator is wider than denominator.
2695: Pretty print of -x/y

Implemented one possible solution: Shift denominator one character
to the right when certain conditions apply:
- Numerator is negative,
- Numerator is even width,
- Numerator is wider than denominator.
Merge branch '2695_pretty_print_fractions' of github.com:nelsoner193/sympy into 2695_pretty_print_fractions

Getting everything to play nicely together, while making sure my branch
is updated.
Note where the built docs