Merge remote-tracking branch 'upstream/master'
Fixed PEP 8 coding style violations (all but E501)

`pep8 --ignore=E501 --exclude=conf.py,tomopy/algo* */*/*/*.py` returns
no output any :smiley:
I tried to be more prudent with whitespace changes now and did them all
manually.

TODO: Fix E501 errors.

As part of http://24pullrequests.com
Fix (most) PEP8 coding style violations

TODO: Fix E501 errors.

As part of http://24pullrequests.com
Fix (most) PEP8 coding style violations

TODO: Fix E501 errors.

As part of http://24pullrequests.com
Merge pull request #55 from habi/make_pep8_happy

Fixed (most) PEP 8 coding style violations in preprocessing algorithms