Lifted MAX $RecursionLimit to 512
Support more trailing operators
Slight performance improvement

test the existence of imported names outside the loop
and make sure they are imported before entering the loop
Sample output updated to new MAX

New MAX $RecursionLimit is now 512
Allow many symbols in Protect and Unprotect

This fixes issue #95 reported by langit
Fix a typo in numbertheory.py, fix some docstrings.

Some improper formatting in docstrings was preventing
a few symbols from showing up in the documentation.
rename AntiMinus to PrePlus
Fix IntegerExponent erroring on symbolic input.

IntegerExponent's pattern was changed to evaluate
only on [_Integer, _Integer] input.
Fix IntegerExponent erroring on symbolic input.

IntegerExponent's pattern was changed to evaluate
only on [_Integer, _Integer] input.
Add IntegerExponent test to verify symbolic behavior.
Merge pull request #109 from sn6uv/PrePlus

rename AntiMinus to PrePlus
import settings compatible with Django 1.5
import settings directly outside Django-related modules
Merge pull request #96 from langit/master

Lifted MAX $RecursionLimit to 512
correct $RecursionLimit tests
returned $RecursionLimit default to 200, but set keep MAX_RECURSION_DEPTH as 512
Merge pull request #111 from sn6uv/RecursionLimit

correct $RecursionLimit tests
Fix minor typos and pare down some noisy function tests in the docs.
Merge pull request #108 from freshwater/typofix

Fix a typo in numbertheory.py, fix some docstrings.