add new state, fix bugs

• change OK status to be shown only in the finished queue
• show ready in the working queue
• fix bug when scheduling

v0.3.7 Much faster lock free

• fix schedule and finished queue bug
• much faster response with lock free

v0.3.6: fix front-end api hostname bug

• fix front-end api hostname bug

v0.3.5 fix front-end api port bug

• fix front-end api port bug

refreshed interface and bug fixed

• refreshed interface
• add register_time field
• fix check_finished bug

v0.3.3 update main thread quit mechanism and fix bugs

• update the main thread quit mechanism to support normal quit if errors occur in the sub-threads
• fix check_finished bug
• remove the redundant backend command function

v0.3.2 Fix WatchClient bug

fix watchclient bug

v0.3.1 rename Client and fix bugs

Merge pull request #5 from Spico197/dev

change `Client` into `WatchClient`, fix `ClientCollection` and `send_email` bug

scheduling mode support

Merge pull request #4 from Spico197/dev

fix readme format

v0.2.2

Merge pull request #1 from Spico197/dev

Dev