fixed documentation bug as per issue #4029
Merge pull request #2495 from perseus0807/4029_iterables

fixed documentation bug as per issue #4029
Add Vinit Ravishankar to AUTHORS/aboutus. Welcome to SymPy!
Merge pull request #2511 from smichr/auth

Add Vinit Ravishankar to AUTHORS/aboutus. Welcome to SymPy!
Make bin/ask_update.py grab the right sympy
New assumptions: zero is even

This also lets it deduce that zero is an integer.
Use a context manager in ask_update.py
Sort the keys in the ask_generated.py dictionary

This will make the diffs much less drastic when new facts are added.
Merge branch 'zero_is_even' into newassump
Add a start to a handler system for newask

I haven't integrated it into newask yet.
Fix a bug in newhandlers

The set returned by __getitem__ has to be the same set used by the
defaultdict, because of mutability.
Start using the newhandlers in newask