Fixing the bug for IE9

To fix the IE 9 bug, I put //= require jquery.placeholder in
application.js. This file is located in
app/assets/javascripts/application.js. Then, I added thislast line in
the file app/views/accounts/new.html.slim:  $('input,
textarea').placeholder();
Merge pull request #406 from sradutta/develop

Fixing the bug for IE9