Version 2.0.26

Fixed some bugs.

Version 2.0.25

Improved wrap, all, any and settle

Version 2.0.24

Changed state, value and reason of Future to private fields.

Version 2.0.23

Added promisify.

Version 2.0.22

Changed fsockopen to pfsockopen
Fixed 28: Operation time out after xxxx milliseconds with 0 bytes received
Improved co & toPromise
Added httpHeader support for http client

Version 2.0.21

Added methods and isMissingMethod on service context.
Improved retry.

Version 2.0.20

Improved push promise data.

Version 2.0.19

Added isSubscribed and subscribedList.

Version 2.0.18

Improved push service.

Version 2.0.17

Fixed timeout bug of Socket Client & Server.
Fixed memory leak when client timeout shorter than push server.