Add build status widget to README
Add build status widget to README

kecsap/LibXtract,jamiebullock/LibXtract,jamiebullock/LibXtract,kecsap/LibXtract,caseybasichis/LibXtract,eriser/LibXtract,caseybasichis/LibXtract,jamiebullock/LibXtract,caseybasichis/LibXtract,eriser/LibXtract,eriser/LibXtract,kecsap/LibXtract