Upload IOS Travis CI

[wrmswindmill]

if WeexDemo build success and pass all the test case in WeexUITestDemo, then it will be success.
but there are not any test cases at all(only the test case template now!)

the following is the shell command:

xcodebuild  -workspace WeexDemo.xcworkspace test -scheme WeexDemo CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO -destination "platform=iOS Simulator,name=iPhone 6"

[wrmswindmill]

I'm sorry to test so much times online, because my local programming env is broken.(I am fixing it) and in my Travis CI ,it build success(but actually it should be failed)

[wrmswindmill]

Error log:

so 'base/third_party/icu/icu_utf.h' file not found

this error caused by the pr in weex-sdk :apache/incubator-weex#2693
it change the file WeexSDK.podspec at root directory,

exclude:
'weex_core/Source/base/message_loop',
'weex_core/Source/base/third_party',
 'weex_core/Source/base/thread',

so base/third_party/icu/icu_utf.h not found.

[wqyfavor]

Some xcuserdata file should not be committed.

[wqyfavor]

OK