added packages and requirements

.travis.yml

@@ -1,7 +1,18 @@
 language: python
 python:
   - "2.7"
-
+addons:
+  apt:
+    packages:
+      - build-essential
+      - libcap-dev
+      - python-qt4
+      - tor
+      - xvfb
+install:
+  - pip install -r requirements.txt
+  - ln -s src pybitmessage  # tests environment
+  - python setup.py install
 script:
   - python checkdeps.py
   - xvfb-run src/bitmessagemain.py -t