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
Fixed base64 encoding.
Compilation error on Windows with SSL enabled (#111)
Merge pull request #112 from Dunemaster/master

Compilation error on Windows with SSL enabled (#111)
Merge remote-tracking branch 'upstream/master'
Document NNTP
Fix LIST DISTRIBUTIONS
mailimap -> newsnntp
Merge pull request #114 from CodaFi/NNTP-Docs

NNTP Docs
add db-5.3
Merge pull request #115 from henrich/master

add db-5.3 support
implement X-GM-MSGID search
implement X-GM-MSGID search
Merge pull request #116 from bvanosten/master

Gmail Message ID Search Support