for cleaning .o and .d files generated by android demo
Merge pull request #915 from ruil2/expand_pic_1

update decoder mac project for expand picture files position change
Update common.xcodeproj to build successfully
Merge pull request #917 from KentoMoriwaki/fix/ios-demo-build

Update common.xcodeproj to build successfully
and space to colon, modify bad note
Merge pull request #918 from syureyi/de7621

for cleaning .o and .d files generated by android demo
Remove unnecessary autogenerated stub iOS test projects

The actual unit tests will be hooked up in a separate project.
Merge pull request #920 from mstorsjo/remove-ios-tests

Remove unnecessary autogenerated stub iOS test projects
resolve unit test warnings