PEP8 and fix various flake8 warnings
added THANKS.txt
Merge pull request #73 from sciunto/pep8

PEP8 and fix various flake8 warnings
candidate fix for confidence_intervals() and copy_params_on_output
avoid divide by 0 messages
change "dict comprehension" to python2.6 compatibility
merge from danballan's PR
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
PEP8: fix whitespaces
better python3 support
rearranged test for PYLAB
Merge pull request #78 from sciunto/improvements

Minor: Improvements