Pull Request!

[hlung]

Hi Chakrit!

Don't merge yet! I think we need to fix issues below first. Need your help ;)

I have merged your master branch changes to mine, fixed conflicts.
I can run example target and can connect to sip server.

Additions

• add GSCallInfo class
• change -connect method to -connectWithCompletion:
• remove unnecessary KVO codes (-willChangeValueForKey, -didChangeValueForKey stuffs)

There are some issues I don't know how to solve. listed below.
major problems

• cannot build for iPhone retina (4-inch 64-bit) simulator. I see the fat lib already has arm64. But it still doesn't work. May be there's some bad config in project.
• docs submodule cannot be downloaded (I removed it in order to make it work, may need to put it back).
• after pjsip submodule is downloaded, I still need to copy 'pjsip/config_site.htopjsip/src/pjlib/include/pj/config_site.h` to make it build. may need to add that to readme.md

minor problems

• some of your sip account doesn't work. please check. (one is chakrit@getonsip.com)

[chakrit]

Will check tomorrow evening na.