Change CI to use conda for cvxpy fix

.travis.yml

@@ -1,18 +1,37 @@
+# from http://conda.pydata.org/docs/travis.html
 language: python
 dist: trusty
+env:
+  - CVXPY_VERSION=0.4.9
+  - CVXPY_VERSION=1.0.1
 python:
-# 2.7 not currently supported
-#   - "2.7"
    - "3.4"
    - "3.5"
    - "3.6"
    - "3.6-dev" # 3.6 development branch
-before_install:
-  - sudo apt-get update
-  # needed to install cvxpy
-  - sudo apt install cmake
 install:
-  - "pip install -r dev-requirements.txt"
+  - sudo apt-get update
+  # We do this conditionally because it saves us some downloading if the
+  # version is the same.
+  - if [[ "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then
+      wget https://repo.continuum.io/miniconda/Miniconda2-latest-Linux-x86_64.sh -O miniconda.sh;
+    else
+      wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh;
+    fi
+  - bash miniconda.sh -b -p $HOME/miniconda
+  - export PATH="$HOME/miniconda/bin:$PATH"
+  - hash -r
+  - conda config --set always_yes yes --set changeps1 no
+  - conda update -q conda
+  # Useful for debugging any issues with conda
+  - conda info -a
+
+  # Replace dep1 dep2 ... with your dependencies
+  - conda create -q -n test-environment python=$TRAVIS_PYTHON_VERSION coveralls flake8 pytest-cov
+  - conda install -q -n test-environment -c conda-forge lapack
+  - conda install -q -n test-environment -c cvxgrp cvxpy=$CVXPY_VERSION
+  - source activate test-environment
+  - python setup.py install
 # command to run tests
 script:
   - flake8 mapping