Set taskInProgres when beginning to execute a block

Setting graceTime and using block method caused HUD to never appear.
Fixed demo project window size on iOS6.
Fixed button autoresizing in the demo project.
Added iPhone 5 default.png.
Update README.mdown

changed than => then
http://bit.ly/qN1nt4
Setting rootViewController in demo app.
Fixed demo project window size on iOS6.
Fixed button autoresizing in the demo project.
Added iPhone 5 default.png.
Setting rootViewController in demo app.
make the interface conform to the GCC LLVM compiler. atomic keyword is assumed to be the default for property.

http://stackoverflow.com/questions/8288864/property-is-assumed-atomic-by-default
Merge branch 'master' of github.com:jdg/MBProgressHUD
Backward compatible fix for UITextAlignmentCenter deprecation in iOS 6.
Merge pull request #95 from yosit/master

make the interface conform to the GCC LLVM compiler. atomic keyword is assumed to be the default for property.
Making sure that public headers get copied into include/MBProgressHUD.
New integration instructions and some readme cleanup.
Some additional readme tweaks.
Making sure that public headers get copied into include/MBProgressHUD.
New integration instructions and some readme cleanup.
Some additional readme tweaks.