Update .gitignore to ignore unit testing artifacts

Change-Id: I09ebfcef3cf3064193edfe549a7bd081ae8a2697
diff --git a/.gitignore b/.gitignore
index 723ef36..91f22d8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,5 @@
-.idea
\ No newline at end of file
+.idea
+.coverage
+htmlcov
+coverage.xml
+nose2-junit.xml