for cleaning .o and .d files generated by android demo
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
Merge remote-tracking branch 'upstream/master' into travis.osx