SERVER-15403 query planner should not error if $min and $max are equal
SERVER-13635 don't pass NULL opCtx in test harness

Closes #801

Signed-off-by: Benety Goh <benety@mongodb.com>
SERVER-13242 replace tabs in Progress Meter log messages with spaces

Closes #799

Signed-off-by: Benety Goh <benety@mongodb.com>
Merge remote-tracking branch 'upstream/master'