Pytest the entire repo (#980)

* Pytest the entire repo

* Do each directory for now...

* YAML files hate tabs

* Add more requirements

* pip install opencv-python

* Comment out FTP

* Add pandas and sklearn to requirements

* Comment out FTP, graphs, machine_learning, maths, neural_network, project_euler

* Update .travis.yml

* Comment out Data structures

* if __name__ == "__main__":

* pytest --ignore=

* pytest .

* Update .travis.yml

* pytest . --doctest-modules --ignore=${IGNORE}

* Ignore --ignore because it just hangs

dynamic_programming/longest_increasing_subsequence_O(nlogn).py

@@ -37,5 +37,6 @@ def LongestIncreasingSubsequenceLength(v):
 	return length
 	
 
-v = [2, 5, 3, 7, 11, 8, 10, 13, 6]
-print(LongestIncreasingSubsequenceLength(v))
+if __name__ == "__main__":
+	v = [2, 5, 3, 7, 11, 8, 10, 13, 6]
+	print(LongestIncreasingSubsequenceLength(v))