Change to protocol-less URI

The protocol check is not needed when the only part of the URI that changes is the protocol.

Can simply use _//ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js_ as the src attribute and it will work in both HTTP and HTTPS cases.

Reference: [section 4.2 of RFC 3986](http://tools.ietf.org/html/rfc3986#section-4.2)
add support for swf preview
update README
Edited lib/hooks/view_layouts_base_html_head_hook.rb via GitHub
Merged pull request #16 from LuisSerrano/patch-1.

Edited lib/hooks/view_layouts_base_html_head_hook.rb via GitHub
remove MessageController from the hook file.
fix image path for IE AlphaImageLoader
fixed deleting of issue attachments
Merge pull request #25 from mschiller/master

fixed attachment destroy link for issue attachments
Update README.markdown
Update README.markdown
include MIT license
Updating codebase for redmine 2.0.1
Updating _links.html.erb with correct indentation, and using updated Redmine routing for 2.0.0
Merge pull request #37 from danmunn/master

Redmine 2.0.0
Updated README
Redmine 1.3 and 2.0 compatible routes; file cleanup
Merge pull request #39 from danmunn/master

Redmine 2.x and 1.3/1.4 side by side
Added semicolons
Added ability (Redmine 2.1.x) to show resized thumbnails instead large images with stricted sizes to 180px. For more details look on issue http://www.redmine.org/issues/1006 - this commit added support for feature from link.