Prevents ?do=addlink from generating a 404 if the user is not logged in
Fixes https://github.com/shaarli/Shaarli/issue/47
Merge pull request #61 from pikzen/shaarli47

Prevents ?do=addlink from generating a 404 if the user is not logged in
Fixes https://github.com/sebsauvage/Shaarli/issues/141
Fixes https://github.com/shaarli/Shaarli/issues/47
Added a link to the visible URL in the link list
Corrected CSS to prevent a line from showing underneath
Fixes https://github.com/shaarli/Shaarli/issues/53
Merge pull request #62 from pikzen/linkurl

Added a link to the visible URL in the link list
add sprites.png (toolbar icons sprite)
 * icons from http://fontawesome.io/, converted to png using http://fa2png.io/
 * Licensed under SIL Open Font License (http://scripts.sil.org/OFL)
 * sprite generated using imagemagick 'convert *.png +append sprites.png'
update COPYING for icons
Toolbar improvements:
 * use sprite icons in toolbar
 * remove "Home" button text (icon only)
 * make ATOM button optional, fixes https://github.com/shaarli/Shaarli/issues/24
  * ATOM button display is now configurable using the SHOW_ATOM variable in index.php or data/options.php (defaults to false)
 * Change "RSS Feed" to "Subscribe" for ease of use
  * Users unfamiliar with RSS will get the meaning of the button, while users familiar with it will recognize the RSS ico
fix partial merge