Config to setup coveralls

Use coveralls will report code coverage on the PR.
This will only measure coverage using unit tests for the time being.

.coveragerc

@@ -1,3 +1,13 @@
 [run]
 branch = True
 source = cwltool
+
+[report]
+exclude_lines =
+    if self.debug:
+    pragma: no cover
+    raise NotImplementedError
+    if __name__ == .__main__.:
+ignore_errors = True
+omit =
+    tests/*

.travis.yml

@@ -9,10 +9,13 @@ python:
 os:
   - linux
 install:
-  - pip install tox-travis
+  - pip install tox-travis coveralls
 script: tox
 branches:
   only:
     - master
 notifications:
-  email: false
+  email: false
+
+after_success:
+  - coveralls

tox.ini

@@ -18,12 +18,14 @@ skip_missing_interpreters = True
 3.6 = py36
 
 [testenv]
+passenv = TRAVIS TRAVIS_JOB_ID TRAVIS_BRANCH
 deps =
   -rrequirements.txt
   py{27,33,34,35,36}-lint: flake8
 
 commands =
-  py{27,33,34,35,36}-unit: python setup.py test
+  py{27,33,35,36}-unit: python setup.py test
+  py34-unit: coverage run setup.py test
   py{27,33,34,35,36}-lint: flake8 schema_salad setup.py
 
 whitelist_externals =