Added space between factors when InvisibleTimes is used
Merge pull request #187 from GitAnt/master

Added space between factors when InvisibleTimes is used
Merge pull request #185 from bnjones/master

Minor setup.py fixes
Fix GridBox UnicodeEncodeError under MathMLForm (issue #182)
Avoid returning Unicode strings from __repr__()

http://bugs.python.org/issue5876 says ".__repr__() is not really
allowed to return Unicode objects in Python 2.x." If it does, the
interpreter tries to encode the Unicode string according to
sys.getdefaultencoding(), which is usually ASCII.

This means that any Unicode characters in expressions might cause
UnicodeEncodeError to be raised in strange places (e.g. when trying to
debug with pdb). Avoid this by escaping Unicode characters in
__repr__().
Replace literal mu with \u03bc
Update MathMLForm test according to PR #187