added table plugin.

Hi jsPDF project is awesome 

i have written table plugin for jsPDF it accepts array of objects as table data and draws table on the document,
no of columns equal to no of keys in first object in array larger text will be splited automatically into lines.Examples available at  <a href="https://github.com/Prashanth-Nelli/jsPdfTablePlugin">jsPdfTablePlugin</a>.