added bower install instructions to README.md
added bower install instructions to README.md

cornerbodega/JsBarcode,web2solutions/JsBarcode,luthfi401/JsBarcode,wavded/io-barcode,web2solutions/JsBarcode,wavded/io-barcode,lemaiyan/JsBarcode,toddw/io-barcode,cornerbodega/JsBarcode,vertexcs-suraj/JsBarcode,luthfi401/JsBarcode,lemaiyan/JsBarcode,vertexcs-suraj/JsBarcode,toddw/io-barcode,mabelticketing/JsBarcode,lindell/JsBarcode,lindell/JsBarcode,mabelticketing/JsBarcode