pep8 fixes

blosc/toplevel.py:37:14: E261 at least two spaces before inline comment
blosc/toplevel.py:41:56: E702 multiple statements on one line (semicolon)
blosc/toplevel.py:44:13: E261 at least two spaces before inline comment
blosc/toplevel.py:80:77: E502 the backslash is redundant between brackets
blosc/toplevel.py:151:77: E502 the backslash is redundant between brackets
blosc/toplevel.py:159:1: E302 expected 2 blank lines, found 1
blosc/toplevel.py:222:17: E123 closing bracket does not match indentation of
opening bracket's line
blosc/toplevel.py:225:68: E502 the backslash is redundant between brackets
blosc/toplevel.py:233:1: E302 expected 2 blank lines, found 1
blosc/toplevel.py:311:72: E502 the backslash is redundant between brackets
blosc/toplevel.py:364:1: E303 too many blank lines (3)
blosc/toplevel.py:368:62: E502 the backslash is redundant between brackets
Merge pull request #20 from esc/pep8/toplevel.py

Minor pep8 fixes.