add scene change detector for further extension
remove black space at lineend
Merge pull request #535 from volvet/add-scene-change-detector

Add scene change detector
add screen change detector for desktop share
remove blank space
Modify xcode project to fit common reorg.
Merge pull request #543 from zhilwang/reorgcommon-xcode

Modify xcode project to fit common reorg.
        use the same frame type EVideoFrameType in encoder internal
Remove unnecessary/superfluous parentheses in slice_multi_threading.cpp
Merge pull request #544 from ruil2/encoder_update

        use the same frame type EVideoFrameType in encoder internal
Merge pull request #542 from volvet/add-scene-change-detector-screen

Add scene change detector screen
Automatically pick the latest installed iOS SDK when building with make

This avoids having to update the makefile just to change the SDK
version whenever the iOS SDK is updated (since the previous
version is removed on updates).
Merge pull request #545 from mstorsjo/remove-extra-parentheses

Remove unnecessary/superfluous parentheses in slice_multi_threading.cpp
Merge pull request #546 from mstorsjo/ios-sdk-version

Automatically pick the latest installed iOS SDK when building with make
Merge remote-tracking branch 'upstream/master' into travis.osx