removing pycrypto hard dep

.travis.yml

@@ -2,9 +2,7 @@ language: python
 
 sudo: false
 
-cache:
-  directories:
-    - $HOME/.pip-cache/
+cache: pip
 
 python:
   - '2.7'
@@ -12,21 +10,7 @@ python:
   - '3.5'
 
 install:
-  - |
-      if [ "$TRAVIS_PYTHON_VERSION" = "pypy" ]; then
-        export PYENV_ROOT="$HOME/.pyenv"
-        if [ -f "$PYENV_ROOT/bin/pyenv" ]; then
-          pushd "$PYENV_ROOT" && git pull && popd
-        else
-          rm -rf "$PYENV_ROOT" && git clone --depth 1 https://github.com/yyuu/pyenv.git "$PYENV_ROOT"
-        fi
-        export PYPY_VERSION="5.0.1"
-        "$PYENV_ROOT/bin/pyenv" install --skip-existing "pypy-$PYPY_VERSION"
-        virtualenv --python="$PYENV_ROOT/versions/pypy-$PYPY_VERSION/bin/python" "$HOME/virtualenvs/pypy-$PYPY_VERSION"
-        source "$HOME/virtualenvs/pypy-$PYPY_VERSION/bin/activate"
-      fi
-  - if [[ $TRAVIS_PYTHON_VERSION == '3.5' ]]; then pip install pycrypto pg8000; fi;
-  - if [[ $TRAVIS_PYTHON_VERSION != '3.5' ]]; then pip install -e .; fi;
+  - pip install -e .
 
 before_script:
   - pip install coverage