Updated Eve, Flask, and Werkzeug. Adjusted code to make Pillar work again.

Eve     : 0.6.3   → 0.7.3
Flask   : 0.10.1  → 0.12.2
Werkzeug: 0.11.10 → 0.11.15

Also updated some secondary requirements.

pillar/tests/__init__.py

@@ -410,7 +410,7 @@ class AbstractPillarTest(TestMinimal):
             headers['Content-Type'] = 'application/json'
 
         if etag is not None:
-            if method == 'PUT':
+            if method in {'PUT', 'PATCH', 'DELETE'}:
                 headers['If-Match'] = etag
             elif method == 'GET':
                 headers['If-None-Match'] = etag