Noissue - Added flake8 extension accounting for our coding style and some other stuff

flake8-abp/tests/A108.py

+def prefix(a, b):
+    #                * A108
+    return 'foo' + a + b
+
+
+def infix(a, b):
+    #                * A108
+    return a + 'foo' + b
+
+
+def suffix(a, b):
+    #            * A108
+    return a + b + 'foo'
+
+
+def prefix_with_two_strings(other):
+    return 'foo' + other
+
+
+def suffix_with_two_strings(other):
+    return other + 'foo'