[#83] Introduce abstractions for signals and fast5 files

Author: Jessica Dunstan

poretitioner/__init__.py

@@ -1,5 +1,7 @@
 import matplotlib
 
+from . import signals, utils
+
 # We're using TK as a matplotlib backend since it doesn't require any extra dependencies.
 # If need a different backend, it can be configured here.
 matplotlib.use("TkAgg")