Merge pull request #1 from chrwei/master

Add Leonardo support
make begin non-blocking when card is not present
make begin non-block when card is not present
make begin non-blocking when card is not present
make begin non-blocking when card is not present
Update chatServer.ino
make begin non-blocking when card is not present
make begin non-blocking when card is not present
make begin non-blocking when card is not present
Added the Leonardo support message to README.
Added socket server timeout feature support.
Merge pull request #5 from madprogrammi/master

Added the Leonardo support message to README.
Merge pull request #4 from chrwei/master

Add Leonardo instructions
Merge pull request #2 from chrwei/being-non-block

Make begin() non-blocking
Merge pull request #1 from itead/master

update from itead