TravisCI and CodeCov added

.travis.yml

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+language: python
+python:
+  - "3.6"
+install:
+  - pip install .
+  - pip install -r requirements.txt
+  - codecov
+# command to run tests
+script: coverage run tests.py

requirements.txt

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+httplib2
+icalendar
+pytz
+datetime
+coverage

test.py

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+import unittest
+
+from test.test_icaldownload import *
+from test.test_icalparser import *
+
+unittest.main()