adding the russian ruble icon. please, no more +1s...

css/font-awesome.css

@@ -1202,6 +1202,11 @@
 .fa-jpy:before {
   content: "\f157";
 }
+.fa-ruble:before,
+.fa-rouble:before,
+.fa-rub:before {
+  content: "\f158";
+}
 .fa-won:before,
 .fa-krw:before {
   content: "\f159";

css/font-awesome.min.css

@@ -336,6 +336,7 @@
 .fa-dollar:before,.fa-usd:before{content:"\f155";}
 .fa-rupee:before,.fa-inr:before{content:"\f156";}
 .fa-cny:before,.fa-rmb:before,.fa-yen:before,.fa-jpy:before{content:"\f157";}
+.fa-ruble:before,.fa-rouble:before,.fa-rub:before{content:"\f158";}
 .fa-won:before,.fa-krw:before{content:"\f159";}
 .fa-bitcoin:before,.fa-btc:before{content:"\f15a";}
 .fa-file:before{content:"\f15b";}

less/icons.less

@@ -327,6 +327,9 @@
 .fa-rmb:before,
 .fa-yen:before,
 .fa-jpy:before { content: @jpy; }
+.fa-ruble:before,
+.fa-rouble:before,
+.fa-rub:before { content: @rub; }
 .fa-won:before,
 .fa-krw:before { content: @krw; }
 .fa-bitcoin:before,

less/variables.less

@@ -635,6 +635,8 @@
 
   @jpy: "\f157";
 
+  @rub: "\f158";
+
   @krw: "\f159";
 
   @btc: "\f15a";

scss/_icons.scss

@@ -327,6 +327,9 @@
 .icon-rmb:before,
 .icon-yen:before,
 .icon-jpy:before { content: $jpy; }
+.icon-ruble:before,
+.icon-rouble:before,
+.icon-rub:before { content: $rub; }
 .icon-won:before,
 .icon-krw:before { content: $krw; }
 .icon-bitcoin:before,

scss/_variables.scss

@@ -634,6 +634,8 @@ $inr: "\f156";
 
 $jpy: "\f157";
 
+$rub: "\f158";
+
 $krw: "\f159";
 
 $btc: "\f15a";

src/icons.yml

@@ -2234,6 +2234,16 @@ icons:
     categories:
       - Currency Icons
 
+  - name:       Russian Ruble (RUB)
+    id:         rub
+    unicode:    f158
+    created:    4.0
+    aliases:
+      - ruble
+      - rouble
+    categories:
+      - Currency Icons
+
   - name:       Korean Won (KRW)
     id:         krw
     unicode:    f159