Drop PyPy support (bcrypt via coaster is incompatible)

.travis.yml

@@ -4,7 +4,6 @@ cache: pip
 python:
   - "2.7"
   - "3.6"
-  - "pypy"
 addons:
   postgresql: "9.4"
 services:
@@ -13,14 +12,13 @@ services:
 install:
   - pip install setuptools --upgrade
   - python setup.py develop
-  - pip install nose coverage coveralls
-  - 'if [[ "$TRAVIS_PYTHON_VERSION" != "pypy" ]]; then pip install psycopg2; fi'
+  - pip install nose coverage coveralls psycopg2
+  - 'if [[ "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then pip install PySqlite; fi'
 # command to run tests
 before_script:
   - psql -c 'create database myapp_test;' -U postgres
 script:
-  - 'if [[ "$TRAVIS_PYTHON_VERSION" != "pypy" ]]; then ./runtests.sh; fi'
-  - 'if [[ "$TRAVIS_PYTHON_VERSION" == "pypy" ]]; then SQLALCHEMY_DATABASE_URI="sqlite://" ./runtests.sh ; fi'
+  - ./runtests.sh
 after_success:
   - coveralls
 notifications: