Add Travis CI Build Status in Readme.
Add Travis CI Build Status in Readme.

poly-mer/community,anhoev/cms-mobile,NativeScript/sample-Groceries,dzfweb/sample-groceries,Icenium/nativescript-sample-groceries,poly-mer/community,tjvantoll/sample-Groceries,dzfweb/sample-groceries,dzfweb/sample-groceries,danik121/HAN-MAD-DT-NATIVESCRIPT,qtagtech/nativescript_tutorial,qtagtech/nativescript_tutorial,tjvantoll/sample-Groceries,anhoev/cms-mobile,anhoev/cms-mobile,tjvantoll/sample-Groceries,poly-mer/community,qtagtech/nativescript_tutorial,NativeScript/sample-Groceries,NativeScript/sample-Groceries