remove bootstrap mixins now that we're using bootstrap.css for stylus

Author: DaftMonk

app/templates/client/app/account(auth)/login/login(stylus).styl

@@ -1,33 +1,22 @@
-// Colors
-// --------------------------------------------------
-
-$btnText =                          #fff
-$btnTextAlt =                       #000
-
-$btnFacebookBackground =            #3B5998
-$btnFacebookBackgroundHighlight =   #133783
-
-$btnTwitterBackground =             #2daddc
-$btnTwitterBackgroundHighlight =    #0271bf
-
-$btnGithubBackground =              #fafafa
-$btnGithubBackgroundHighlight =     #ccc
-
-$btnGooglePlusBackground =          #dd4b39
-$btnGooglePlusBackgroundHighlight = #c53727
-
-
 // Social buttons
 // --------------------------------------------------
 
 .btn-facebook
-    button-variant($btnText, $btnFacebookBackgroundHighlight, $btnFacebookBackgroundHighlight)
+    color: #fff;
+    background-color: #3B5998;
+    border-color: #133783;
 
 .btn-twitter
-    button-variant($btnText, $btnTwitterBackground, $btnTwitterBackgroundHighlight)
+    color: #fff;
+    background-color: #2daddc;
+    border-color: #0271bf;
 
 .btn-github
-    button-variant($btnTextAlt, $btnGithubBackground, $btnGithubBackgroundHighlight)
+    color: #fff;
+    background-color: #fafafa;
+    border-color: #ccc;
 
 .btn-google-plus
-    button-variant($btnText, $btnGooglePlusBackground, $btnGooglePlusBackgroundHighlight)
+    color: #fff;
+    background-color: #dd4b39;
+    border-color: #c53727;