Added Travis-CI setup (#1)

- Added 'build' to flake8 exclude
- Fixed a lint error

.travis.yml

+language: python
+python: 2.7
+install:
+  - pip install -r requirements.txt
+  - python setup.py install
+script:
+  - make test

Makefile

@@ -18,4 +18,3 @@ test_unit2:
 
 test_unit3:
 	python3 -bb -m pytest tests/unit
-

databuilder/publisher/elasticsearch_publisher.py

@@ -134,7 +134,7 @@ class ElasticsearchPublisher(Publisher):
         try:
             indices = self.elasticsearch_client.indices.get_alias(self.elasticsearch_alias).keys()
             return indices
-        except NotFoundError as ne:
+        except NotFoundError:
             LOGGER.warn("Received index not found error from Elasticsearch", exc_info=True)
             # return empty list on exception
             return []

setup.cfg

 [flake8]
 format = pylint
-exclude = .svc,CVS,.bzr,.hg,.git,__pycache__,venv,databuilder/sql_parser/usage/presto/antlr_generated
+exclude = .svc,CVS,.bzr,.hg,.git,__pycache__,venv,build,databuilder/sql_parser/usage/presto/antlr_generated
 max-complexity = 10
 max-line-length = 120
 ignore = NONE