Update gradients definitions in Newsblur css to w3c specification

Please update linear-gradients in NB’s css to w3c specification(using the to keyword)[1]. For example:
.NB-modal h5, .NB-module h5, .NB-module-header has:
background-image: linear-gradient(top, #f5f6f2, #e5e6e0);
In this form gradient doesn’t work in Internet Explorer 11. According w3c correct syntax is:
background-image: linear-gradient(to bottom, #f5f6f2, #e5e6e0);
After this change gradient is displayed correctly and this syntax is supported also in Firefox 16+, Chrome 26+ and Internet Explorer 10+[2].

  1. http://www.w3.org/TR/css3-images/#lin…
  2. https://developer.mozilla.org/en-US/d…
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