Add Travis testing.

Author: micahcochran

.travis.yml

@@ -1,8 +1,17 @@
 language: python
+
 python:
-- '2.7'
+  - '2.7'
+  - '3.3'
+  - '3.4'
+  - '3.5'
+
+install:
+  - pip install .
+
 script:
-- touch foo
+  - python shapefile.py
+
 deploy:
   provider: pypi
   user: jlawhead

shapefile.py

@@ -1190,16 +1190,19 @@ def __fieldNorm(self, fieldName):
         fieldName.replace(' ', '_')
 
 # Begin Testing
-def test():
+def test(**kwargs):
     import doctest
     doctest.NORMALIZE_WHITESPACE = 1
-    doctest.testfile("README.md", verbose=1)
-
+    verbosity = kwargs.get('verbose', 1)
+    failure_count, test_count = doctest.testfile("README.md", verbose=verbosity)
+    return failure_count
+    
 if __name__ == "__main__":
     """
     Doctests are contained in the file 'README.md'. This library was originally developed
     using Python 2.3. Python 2.4 and above have some excellent improvements in the built-in
     testing libraries but for now unit testing is done using what's available in
     2.3.
     """
-    test()
+    failure_count = test()
+    sys.exit(failure_count)