fix name :)
PY3: Fix dict for python3
PY3: fix error comparison between None and float
PEP8
PEP8: various corrections
Merge pull request #77 from sciunto/fix_python3

Fix python3 support for  (errors only)
MAINT: import panda once + minor corrections
better python3 support
rearranged test for PYLAB
Merge branch 'master' of https://github.com/lmfit/lmfit-py