Update jquery version to 1.11.1

- I created a vendor directory to receive these new files
- removed all older jquery versions
- updated the html files to point to this version
- added the jquery-migrate-1.2.1.js file to be informed of problems due
  to the use of this new version(the only logs comes from old bootstrap
  version, I'll remove this import when we'll update to newer version of
  bootstrap)