Make "high replication" the default. App Engine has depreciated the master / slave datastore:

http://googleappengine.blogspot.com/2012/04/masterslave-datastore-thanks-for-all.html
\!appengine build tags
add description of changes and link to original
gofmt
Merge github.com:kylefinley/gae-go-testing
Merged changes from https://github.com/oschmid/appenginetesting