Fixed issue #325

build/less/AdminLTE.less

@@ -7,7 +7,7 @@
 !*/
 
 //google fonts
-@import url(//fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600,700,300italic,400italic,600italic);
+@import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600,700,300italic,400italic,600italic);
 
 //Bootstrap Variables & Mixins
 //The core bootstrap code have not been modified. These files

dist/css/AdminLTE.css

@@ -1,4 +1,4 @@
-@import url(//fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600,700,300italic,400italic,600italic);
+@import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600,700,300italic,400italic,600italic);
 /*!
  *   AdminLTE v2.1.0
  *   Author: Almsaeed Studio

dist/css/AdminLTE.min.css

@@ -1,4 +1,4 @@
-@import url(//fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600,700,300italic,400italic,600italic);/*!
+@import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,400,600,700,300italic,400italic,600italic);/*!
  *   AdminLTE v2.1.0
  *   Author: Almsaeed Studio
  *	 Website: Almsaeed Studio <http://almsaeedstudio.com>