sync with master#1

Merged

kmiku7 merged 8 commits intokmiku7:masterfrom

Jan 17, 2018

Commits on Jan 10, 2018

ARROW-1965: [GLib] Add garrow_array_builder_get_value_data_type()
kou
committed
ARROW-1980: [Python] Fix race condition in write_to_dataset

jcrist
authored and
wesm
committed
ARROW-1978: [Website] Consolidate Powered By project list, add more visibly to front page
wesm
committed
ARROW-1977: [C++] Update windows dev docs

Chris Bartak
authored and
wesm
committed
ARROW-764: [C++] Improves performance of CopyBitmap and adds benchmarks

seibs
authored and
wesm
committed
ARROW-1927: [Plasma] Add delete function

JinHai-CN
authored and
pcmoritz
committed
ARROW-1971: [Python] Add pandas serialization to the default

devin-petersohn
authored and
wesm
committed

Commits on Jan 11, 2018

ARROW-1979: [JS] Fix JS builds hanging in es2015

trxcllnt
authored and
wesm
committed