Updated travis.yml with direct virtual environment links

* Running code from virtual environment specifically
* Cleaned up unused code
* Added comments

.travis.yml

@@ -1,17 +1,17 @@
+# Specify sudo and dist for Travis-CI environment
 sudo: required
 dist: trusty
 
+# Specify Python versions being used and tested
 language: python
 python:
   - "3.5"
 
-# Install dependencies
+# Install dependencies to virtual environment
 install:
-  - pip3 install -r requirements.txt
+  - ~/virtualenv/python3.5/bin/pip3 install -r requirements.txt
 
-# Run tests
+# Run tests from virtual environment
 script:
-  - flake8 --exclude docs/ .
-#  - pytest --ignore=tests/test_tun.py tests/
-  - sudo ~/virtualenv/python3.5/bin/pip3 freeze
+  - ~/virtualenv/python3.5/bin/flake8 --exclude docs/ .
   - sudo ~/virtualenv/python3.5/bin/pytest tests/