Various Fixes to multistructlog

- Force color output on structured-color formatter
- Add log levels and timestamps to output
- Fix reinitialization issue
- Cleanup/clarify README, add changelog

Change-Id: I11433f362e7c1ab8c1ee9fbca2081e136b57f22c
diff --git a/tox.ini b/tox.ini
index bd840cf..f1e9673 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,3 +26,5 @@
   nose2 --verbose --junit-xml
   flake8
 
+[flake8]
+max-line-length = 120