Merge remote-tracking branch 'upstream/master'
Fixed https://github.com/MailCore/mailcore2/issues/445 : parse MIME encoded Content-Type
Merge remote-tracking branch 'upstream/master'
Fix search key
Merge pull request #96 from CodaFi/Sent-Before-Key-Fix

Sent before key fix
Merge remote-tracking branch 'upstream/master'
implement mailimap X-GM-RAW
Added free()
One more time
Merge pull request #98 from CodaFi/X-GM-RAW-2

Implemented SEARCH X-GM-RAW.
wipe off a error report in gyp/gcc
tweak: use socklen_t replacing uint
Merge pull request #99 from yorkie/patch-1

replaced uint with socklen_t.
remove duplicate calls
Merge pull request #102 from yorkie/patch-1

remove duplicate calls
use `SSL_MODE_RELEASE_BUFFERS` to save memory
Windows native locks support
Merge pull request #103 from yorkie/patch-2

use `SSL_MODE_RELEASE_BUFFERS` to save memory
Fixed compile error on Windows
Fixed build without zlib