implementing issue 28. commit before test on dev1 server. (7)

28) add share icons to api_gift (one icon for each api provider)
    share with a deep link
    allow all to share or allow only giver/receiver to share?
    http://jquery-plugins.net/tag/social-share-button
    add gift link "share" - onclick JS replace link with LOV or share buttons for n social networks
    a) problem with popup blocking: window.open('<%= @link %>', '_blank')
    b) problem with double url encoding. Encoded in rails. Also encoded when sending JS to client: &amp; in stead of & in url param
    add ajax spinner while fetching share url from server. Normally quick, but server is slow and small.
    http://developer.sharethis.com/Web_Share_API
    https://github.com/bradvin/social-share-urls
    todo:
    - Pinterest: https://pinterest.com/pin/create/bookmarklet/?media={img}&url={url}&is_video={is_video}&description={title}
    - Buffer: http://bufferapp.com/add?text={title}&url={url}
    - Digg: http://digg.com/submit?url={url}&title={title}
    - Tumblr: http://www.tumblr.com/share/link?url={url}&name={title}&description={desc}
    - Reddit: http://reddit.com/submit?url={url}&title={title}
    - StumbleUpon: http://www.stumbleupon.com/submit?url={url}&title={title}
    - Delicious: https://delicious.com/save?v=5&provider={provider}&noui&jump=close&url={url}&title={title}