add pep8 tests and fix lexical indentation for python3

These are the pep8 tests that break python3,
such as mixing tabs and spaces for indentation.

I ignored all the pep8 tests that seemed only stylistic,
such as "visual" indentation.

http://docs.python.org/3.3/reference/lexical_analysis.html

setup.py

@@ -50,7 +50,7 @@ setup(
         'Intended Audience :: Information Technology',
         'Programming Language :: Python'
     ],
-#    test_suite = 'nose.collector',
+    #test_suite = 'nose.collector',
 )
 
 

src/tito/builder/main.py

@@ -27,6 +27,7 @@ from tempfile import mkdtemp
 from tito.common import *
 from tito.common import scl_to_rpm_option, get_latest_tagged_version, \
     find_wrote_in_rpmbuild_output
+from tito.compat import *
 from tito.exception import RunCommandException
 from tito.release import *
 from tito.exception import TitoException

test/unit/pep8-tests.py

@@ -32,12 +32,20 @@ class TestPep8(TitoUnitTestFixture):
     def test_conformance(self):
         tests = [
             # http://pep8.readthedocs.org/en/latest/intro.html#error-codes
+            'E101',  # indentation contains mixed spaces and tabs
+            'E111',  # indentation is not a multiple of four
+            'E112',  # expected an indented block
+            'E113',  # unexpected indentation
+            'E121',  # continuation line indentation is not a multiple of four
+            'E122',  # continuation line missing indentation or outdented
+            'E126',  # continuation line over-indented for hanging indent
             'E2',    # whitespace errors
             'E3',    # blank line errors
             'E4',    # import errors
             'E502',  # the backslash is redundant between brackets
             'E7',    # statement errors
             'E9',    # runtime errors (SyntaxError, IndentationError, IOError)
+            'W1',    # indentation warnings
             'W2',    # whitespace warnings
             'W3',    # blank line warnings
             'W6',    # deprecated features