Add Travis status image to README
Add Travis status image to README

adube/ngeo,gberaudo/ngeo,pgiraud/ngeo,adube/ngeo,mygu/ngeo,tsauerwein/ngeo,Jenselme/ngeo,mygu/ngeo,camptocamp/ngeo,kalbermattenm/ngeo,Jenselme/ngeo,ger-benjamin/ngeo,tsauerwein/ngeo,ger-benjamin/ngeo,kalbermattenm/ngeo,ger-benjamin/ngeo,Jenselme/ngeo,elemoine/ngeo,mygu/ngeo,camptocamp/ngeo,balpreetspankaj/ngeo,elemoine/ngeo,Jenselme/ngeo,pgiraud/ngeo,pgiraud/ngeo,adube/ngeo,camptocamp/ngeo,gberaudo/ngeo,camptocamp/ngeo,balpreetspankaj/ngeo,gberaudo/ngeo,kalbermattenm/ngeo,camptocamp/ngeo,balpreetspankaj/ngeo,elemoine/ngeo,adube/ngeo