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

Merge pull request vnpy#477 from vnpy/beta

v1.7正式发布

Merge branch 'master' of https://github.com/vnpy/vnpy

Merge pull request vnpy#305 from vnpy/beta

Beta

Merge pull request vnpy#294 from vnpy/beta

v1.6发布

Merge pull request vnpy#261 from vnpy/beta

Beta

Merge pull request vnpy#208 from vnpy/dev

v1.4合并

Merge pull request vnpy#187 from vnpy/dev

修复合并错误