Upgraded JQuery version
Moved javascript for creation of a new planet to a separate file

Changes made in form.js
1) Made "Create Planet" a submit input, previously it was a link.
   It doesn't make any difference in the look, but simplified the
   form submission process.
2) Used 'submitHandler' for submitting the form if form is valid
3) While submitting form (in save function), no need to convert the
   data to JSON explicitly.
4) Some minor changes for better readability of the code