Update coverage config

.coveragerc

@@ -8,3 +8,4 @@ exclude_lines =
 	pragma: no cover
 	if 0:
 omit = nilmdb/utils/datetime_tz*,nilmdb/scripts,nilmdb/_version.py,nilmdb/fsck
+show_missing = True

setup.cfg

@@ -13,8 +13,6 @@ cover-package=nilmdb
 cover-erase=1
 # this works, puts html output in cover/ dir:
 # cover-html=1
-# need nose 1.1.3 for this:
-# cover-branches=1
 #debug=nose
 #debug-log=nose.log
 stop=1