Merge pull request #570 from jeff1evesque/php_index

#569: index.php, update jquery reference to 2.1.1
#571: README.md, Adjust 'Linux Packages' Subsection
Merge pull request #572 from jeff1evesque/doc_linux_packages

#571: README.md, Adjust 'Linux Packages' Subsection
#432: jquery-validate.js, update file to correct v1.13.1
Merge pull request #573 from jeff1evesque/js_jquery_validate

#432: jquery-validate.js, update file to correct v1.13.1
#432: jquery-validate.js, use v1.9.0
Merge pull request #574 from jeff1evesque/js_jquery_validate

#432: jquery-validate.js, use v1.9.0
#432: jquery-validate.js, reimplement v1.13.1
Merge pull request #575 from jeff1evesque/js_jquery_validate

#432: jquery-validate.js, reimplement v1.13.1
#473: index.php, add 'jquery-validate' css