add test showing two primaries will resolve themselves even if they don't see each other
add GTIDManager unit test
add a test that shows highestKnownPrimaryInSet gets percolated properly
add a test of priority
test hook
start work on consensus.js test
small fix to consensus to make tests a bit more reliable
add replSetElect tests to consensus.js, also tweak it a bit
bump up replica set's highest known primary when we vote yes for something, because that yes vote means we are no longer acknowledging writes below that value.
add small test case to consensus.js
add a simple unit test showing that acknowledgement works properly
refs #910, do mongod bit for this, and add test for gle
small tweaks