[Merge] pull request vnpy#1410 from vnpy/v2.0-DEV

V2.0 dev

[Merge] pull request vnpy#1377 from vnpy/v2.0-DEV-CTP

V2.0 dev ctp

Merge pull request vnpy#1313 from vnpy/beta

v1.9.2 release beta->master

Merge pull request vnpy#1251 from vnpy/beta

合并v1.9.1到master分支

Merge pull request vnpy#1038 from vnpy/beta

发布v1.9.0正式版

Merge pull request vnpy#883 from vnpy/beta

发布v1.8.1

Merge pull request vnpy#745 from vnpy/beta

发布v1.8.0

Merge pull request vnpy#704 from vnpy/beta

v1.7.3发布

Merge pull request vnpy#630 from vnpy/beta

Beta

Merge pull request vnpy#553 from vnpy/beta

v1.7.1正式PR