added UI button events to render dialog for accpeting sparql end point before fetching models
added UI button events to render dialog for accpeting sparql end point before fetching models

usc-isi-i2/Web-Karma,sylvanmist/Web-Karma,rpiotti/Web-Karma,usc-isi-i2/Web-Karma,sylvanmist/Web-Karma,rpiotti/Web-Karma,rpiotti/Web-Karma,rpiotti/Web-Karma,usc-isi-i2/Web-Karma,sylvanmist/Web-Karma,rpiotti/Web-Karma,usc-isi-i2/Web-Karma,sylvanmist/Web-Karma,usc-isi-i2/Web-Karma,sylvanmist/Web-Karma