use ipython 5.x for python 2.7 and pypy

Author: chfw

.travis.yml

@@ -14,6 +14,8 @@ before_install:
   - "if [[ $TRAVIS_PYTHON_VERSION == 'pypy' ]]; then deactivate && wget https://bitbucket.org/squeaky/portable-pypy/downloads/pypy-5.7.1-linux_x86_64-portable.tar.bz2 -O - | tar -jxf - && echo 'Setting up aliases...' && ln -s pypy-5.7.1-linux_x86_64-portable pypy2-latest && export PATH=$HOME/pypy2-latest/bin/:$PATH && virtualenv --no-site-packages --python ~/pypy2-latest/bin/pypy pypy2-env && echo 'Creating custom env...' && source pypy2-env/bin/activate && python -V; fi"
   - cd -
   - if [[ $TRAVIS_PYTHON_VERSION == "2.6" ]]; then pip install flake8==2.6.2; fi
+  - if [[ $TRAVIS_PYTHON_VERSION == "2.7" ]]; then pip install ipython==5.4; fi
+  - if [[ $TRAVIS_PYTHON_VERSION == "pypy" ]]; then pip install ipython==5.4; fi
   - if [[ -f min_requirements.txt && "$MINREQ" -eq 1 ]]; then
       mv min_requirements.txt requirements.txt ;
     fi