Merge remote-tracking branch 'upstream/master'
Cast key len
Merge pull request #460 from CodaFi/cast-sizes

Cast sizes
Updated to libetpan 23f1554f21fac3aadede8281b79828ca92268755
Merge pull request #456 from bvanosten/master

Support searching by a gmail thread id.
Fixed build of ctemplate and icu4c on iOS