Merge pull request #9 from vegard/patch-1

tests: use __file__ to determine library path

tests/context.py

@@ -2,6 +2,6 @@
 
 import sys
 import os
-sys.path.insert(0, os.path.abspath('..'))
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
 
-import sample
\ No newline at end of file
+import sample