Remove pypy from travis build matrix until issues are resolved

Author: philipn

.travis.yml

@@ -5,8 +5,6 @@ python:
   - "3.2"
   - "3.3"
   - "3.4"
-  - "pypy"
-  - "pypy3"
 env:
   - DJANGO="Django>=1.4,<1.5"
   - DJANGO="Django>=1.5,<1.6"
@@ -26,10 +24,6 @@ matrix:
       env: DJANGO="Django>=1.4,<1.5"
     - python: "3.4"
       env: DJANGO="Django>=1.4,<1.5"
-    - python: "pypy"
-      env: DJANGO="Django>=1.4,<1.5"
-    - python: "pypy3"
-      env: DJANGO="Django>=1.4,<1.5"
     - python: "2.6"
       env: DJANGO="Django>=1.7,<1.8"
   fast_finish: true