Adding travis (#396)

.travis.yml

+language: python
+
+matrix:
+  include:
+    - os: linux
+      python 3.5
+
+    - os: linux
+      python 3.6
+
+    - os: osx
+      language: generic
+      env: PYTHON_VERSION=3.5.3
+
+    - os: osx
+      language: generic
+      env: PYTHON_VERSION=3.6.1
+
+install:
+  - "./.travis/install.sh"
+
+
+script:
+  - "./.travis/run.sh"

.travis/install.sh

+#!/bin/bash
+
+set -e
+set -x
+
+if [[ "$(uname -s)" == 'Darwin' ]]; then
+    sw_vers
+
+    git clone --depth 1 https://github.com/yyuu/pyenv.git ~/.pyenv
+    PYENV_ROOT="$HOME/.pyenv"
+    PATH="$PYENV_ROOT/bin:$PATH"
+    eval "$(pyenv init -)"
+
+    pyenv install $PYTHON_VERSION
+    pyenv global $PYTHON_VERSION
+    pyenv rehash
+
+    pip install --user --upgrade pip
+    pip install --user virtualenv
+    python -m virtualenv ~/.venv
+    source ~/.venv/bin/activate
+fi
+
+python -m pip install -r requirements-dev.txt

.travis/run.sh

+#!/bin/bash
+
+set -e
+set -x
+
+if [[ "$(uname -s)" == "Darwin" ]]; then
+    PYENV_ROOT="$HOME/.pyenv"
+    PATH="$PYENV_ROOT/bin:$PATH"
+    eval "$(pyenv init -)"
+    source ~/.venv/bin/activate
+fi
+
+python -m pytest -n16 tests/

requirements-dev.txt

+future>=0.16.0
+requests>=2.9.1
+paramiko>=1.16.0
+pysnmp>=4.3.2
+pycrypto==2.6.1
+pytest==3.5.1
+pytest-forked==0.2
+pytest-xdist==1.22.2

tox.ini

 [tox]
 skipsdist = True
-envlist = py27,py34,py35,py36
+envlist = py35,py36
 
 [testenv]
 deps =
-    mock
-    pexpect
+    pytest
     -r{toxinidir}/requirements.txt
 
-commands=python -m unittest discover
+commands=python -m pytest -n16 tests/