Update links to build status in README.md
Update links to build status in README.md

The links were missing ".com" before the port that jenkins is running on for some reason.
readium/SDKLauncher-OSX,readium/SDKLauncher-OSX,readium/SDKLauncher-OSX,readium/SDKLauncher-OSX,readium/SDKLauncher-OSX