Features

• Support nonblocking submit and max blocking limit setting (#41)

Bugfixes

• Fix a bug where invokers get stuck in waiting idle workers af70ed06608fd1885efa56ba406b06476bf7060f 08d01b6b480f74dfa5586a8901878cd466b66de8

Misc

• Update example code 6851895376edb834dfbff4e097c1ba6f4a274dda
• Fix some ill-formed code in unit tests b4dce88db77063c9792fb9e0f764b85cb89da1c8