Fix flake8 errors

[justb4]

Flake8 flake8 is a command-line utility for enforcing style consistency across Python projects.

There are still quite some errors in Stetl that need to be fixed:

./stetl/util.py:137:5: C901 'Util.elem_to_dict' is too complex (37)
./stetl/util.py:197:41: E721 do not compare types, use 'isinstance()'
./stetl/util.py:336:9: E722 do not use bare except'
./stetl/util.py:349:1: E722 do not use bare except'
./stetl/util.py:350:5: F401 'StringIO.StringIO' imported but unused
./stetl/util.py:354:1: C901 'TryExcept 354' is too complex (11)
./stetl/util.py:414:32: W601 .has_key() is deprecated, use 'in'
./stetl/filters/templatingfilter.py:166:5: C901 'Jinja2TemplatingFilter.create_template' is too complex (11)
./stetl/filters/xmlassembler.py:73:29: F841 local variable 'e' is assigned to but never used
./stetl/filters/xmlelementreader.py:78:5: C901 'XmlElementReader.process_xml' is too complex (11)
./stetl/filters/xmlelementreader.py:79:15: E714 test for object identity should be 'is not'
./stetl/filters/zipfileextractor.py:40:9: F841 local variable 'event' is assigned to but never used
./stetl/filters/zipfileextractor.py:46:9: F401 'os' imported but unused
./stetl/inputs/deegreeinput.py:49:5: C901 'DeegreeBlobstoreInput.read' is too complex (15)
./stetl/inputs/fileinput.py:153:29: F841 local variable 'e' is assigned to but never used
./stetl/inputs/fileinput.py:195:5: C901 'XmlElementStreamerFileInput.read' is too complex (12)
./stetl/inputs/fileinput.py:354:161: E501 line too long (175 > 160 characters)
./stetl/inputs/fileinput.py:382:29: F841 local variable 'e' is assigned to but never used
./stetl/inputs/fileinput.py:436:33: E251 unexpected spaces around keyword / parameter equals
./stetl/inputs/fileinput.py:437:5: E128 continuation line under-indented for visual indent
./stetl/inputs/fileinput.py:438:91: E203 whitespace before ','
./stetl/inputs/fileinput.py:562:1: W293 blank line contains whitespace
./stetl/inputs/httpinput.py:106:1: W293 blank line contains whitespace
./stetl/inputs/httpinput.py:276:1: W293 blank line contains whitespace
./stetl/outputs/dboutput.py:147:9: E122 continuation line missing indentation or outdented
./stetl/outputs/deegreeoutput.py:64:5: C901 'DeegreeBlobstoreOutput.write' is too complex (11)
./stetl/outputs/deegreeoutput.py:80:35: W601 .has_key() is deprecated, use 'in'
./stetl/outputs/deegreeoutput.py:83:39: W601 .has_key() is deprecated, use 'in'
./stetl/outputs/deegreeoutput.py:91:13: F841 local variable 'ogrGeomWKT' is assigned to but never used
./stetl/outputs/deegreeoutput.py:94:161: E501 line too long (174 > 160 characters)
./stetl/outputs/deegreeoutput.py:158:9: F841 local variable 'gml_doc' is assigned to but never used
./stetl/outputs/deegreeoutput.py:176:9: F841 local variable 'result' is assigned to but never used
./stetl/outputs/ogroutput.py:120:5: C901 'OgrOutput.init' is too complex (16)
./stetl/utils/apachelog.py:156:42: E701 multiple statements on one line (colon)
./stetl/utils/apachelog.py:186:5: C901 'parser.parse' is too complex (20)
./stetl/utils/apachelog.py:204:25: E722 do not use bare except'
./stetl/utils/apachelog.py:209:25: E722 do not use bare except'
./stetl/utils/apachelog.py:225:25: E722 do not use bare except'
./stetl/utils/apachelog.py:331:1: C901 'If 331' is too complex (11)
./stetl/utils/apachelog.py:335:5: E303 too many blank lines (2)
./stetl/utils/apachelog.py:434:84: E502 the backslash is redundant between brackets
./stetl/utils/apachelog.py:435:84: E502 the backslash is redundant between brackets
./stetl/utils/apachelog.py:443:79: E502 the backslash is redundant between brackets
./stetl/utils/apachelog.py:449:78: E502 the backslash is redundant between brackets
./stetl/utils/apachelog.py:470:5: E303 too many blank lines (2)

Once fixed, the flake8 command can be added to the .travis file.

[justb4]

All fixed and flake8 part of Travis build!