add new mappings files and update less and scss main files

less/mappings/wi-dark-sky.less

@@ -0,0 +1,13 @@
+.@{wi-css-prefix}-dark-sky-clear-day:before            { content: @day-sunny     ; }
+.@{wi-css-prefix}-dark-sky-clear-night:before          { content: @night-clear   ; }
+.@{wi-css-prefix}-dark-sky-rain:before                 { content: @rain          ; }
+.@{wi-css-prefix}-dark-sky-snow:before                 { content: @snow          ; }
+.@{wi-css-prefix}-dark-sky-sleet:before                { content: @sleet         ; }
+.@{wi-css-prefix}-dark-sky-wind:before                 { content: @strong-wind   ; }
+.@{wi-css-prefix}-dark-sky-fog:before                  { content: @fog           ; }
+.@{wi-css-prefix}-dark-sky-cloudy:before               { content: @cloudy        ; }
+.@{wi-css-prefix}-dark-sky-partly-cloudy-day:before    { content: @day-cloudy    ; }
+.@{wi-css-prefix}-dark-sky-partly-cloudy-night:before  { content: @night-cloudy  ; }
+.@{wi-css-prefix}-dark-sky-hail:before                 { content: @hail          ; }
+.@{wi-css-prefix}-dark-sky-thunderstorm:before         { content: @thunderstorm  ; }
+.@{wi-css-prefix}-dark-sky-tornado:before              { content: @tornado       ; }

less/weather-icons.less

@@ -26,6 +26,7 @@
 // Mappings to various APIs
 @import "mappings/wi-yahoo.less";
 @import "mappings/wi-forecast-io.less";
+@import "mappings/wi-dark-sky.less";
 @import "mappings/wi-wmo4680.less";
 @import "mappings/wi-owm.less";
 @import "mappings/wi-wunderground.less";

sass/mappings/wi-dark-sky.scss

@@ -0,0 +1,13 @@
+.#{$wi-css-prefix}-dark-sky-clear-day:before            { content: $day-sunny     ; }
+.#{$wi-css-prefix}-dark-sky-clear-night:before          { content: $night-clear   ; }
+.#{$wi-css-prefix}-dark-sky-rain:before                 { content: $rain          ; }
+.#{$wi-css-prefix}-dark-sky-snow:before                 { content: $snow          ; }
+.#{$wi-css-prefix}-dark-sky-sleet:before                { content: $sleet         ; }
+.#{$wi-css-prefix}-dark-sky-wind:before                 { content: $strong-wind   ; }
+.#{$wi-css-prefix}-dark-sky-fog:before                  { content: $fog           ; }
+.#{$wi-css-prefix}-dark-sky-cloudy:before               { content: $cloudy        ; }
+.#{$wi-css-prefix}-dark-sky-partly-cloudy-day:before    { content: $day-cloudy    ; }
+.#{$wi-css-prefix}-dark-sky-partly-cloudy-night:before  { content: $night-cloudy  ; }
+.#{$wi-css-prefix}-dark-sky-hail:before                 { content: $hail          ; }
+.#{$wi-css-prefix}-dark-sky-thunderstorm:before         { content: $thunderstorm  ; }
+.#{$wi-css-prefix}-dark-sky-tornado:before              { content: $tornado       ; }

sass/weather-icons.scss

@@ -26,6 +26,7 @@
 // Mappings to various APIs
 @import "mappings/wi-yahoo.scss";
 @import "mappings/wi-forecast-io.scss";
+@import "mappings/wi-dark-sky.scss";
 @import "mappings/wi-wmo4680.scss";
 @import "mappings/wi-owm.scss";
 @import "mappings/wi-wunderground.scss";