Make isort test properly run again within Travis (#792)

* Fix not properly sorted imports

* Ignore only bdist files build/lib

Travis has `build` in its path name and therefore files got skipped from
isort. To avoid this we only skip `build/lib` which is used by
bdist command.

* Remove obsolete linting configuration

Co-authored-by: Alan Crosswell <alan@columbia.edu>

Author: sliverc

.pylintrc

@@ -7,7 +7,7 @@
 from rest_framework_json_api import serializers, views
 from rest_framework_json_api.renderers import JSONRenderer
 
-from example.models import Author, Comment, Entry, Blog
+from example.models import Author, Blog, Comment, Entry
 
 
 # serializers

example/tests/unit/test_renderers.py

@@ -23,7 +23,8 @@
     EntryDRFSerializers,
     EntrySerializer,
     ProjectSerializer,
-    ProjectTypeSerializer)
+    ProjectTypeSerializer
+)
 
 HTTP_422_UNPROCESSABLE_ENTITY = 422