travis: test with tox

.travis.yml

@@ -3,16 +3,5 @@ language: python
 python:
   - "2.7"
   - "3.4"
-
+install: pip install tox-travis
-install:
+script: tox
-  - pip install ecdsa ed25519  # test without trezorlib for now
-  - pip install pylint coverage pep8
-
-script:
-  - pep8 trezor_agent
-  - pylint --reports=no --rcfile .pylintrc trezor_agent
-  - coverage run --source trezor_agent/ -m py.test -v
-
-after_success:
-  - coverage report
-