Major refactor, package cleanup. Untested.

rtv/exceptions.py

@@ -0,0 +1,12 @@
+class SubmissionError(Exception):
+    "Submission could not be loaded"
+    def __init__(self, url):
+        self.url = url
+
+class SubredditError(Exception):
+    "Subreddit could not be reached"
+    def __init__(self, name):
+        self.name = name
+
+class EscapeInterrupt(Exception):
+    "Signal that the ESC key has been pressed"