Client: use hex value when formatting Buffers

Client: correctly handle ':' and '?' within quotes with prepare()

bump version

src: fix corrupted big queries (> 70K + much concurrency)

Client: allow handle to be cleaned up after close

Client: remove binding handle on close to prevent memory leaks

deps: fix compilation on Windows

deps: fix arm support

src: propogate init status in more places

src: check for async support on init

ci: add node v5

deps: update libmariadbclient to 10.1.8

bump version

CI: update AppVeyor config

src: support older, pre-C++11 compilers