Better wmo default (wi-thermometer instead of ' '), fix bat again

compile.bat

@@ -3,7 +3,7 @@ lessc -version >nul 2>&1 && (
     lessc --verbose weather-icons/weather-icons.less css/weather-icons.css
     lessc --verbose --yui-compress weather-icons/weather-icons.min.less css/weather-icons.min.css
     if %ERRORLEVEL% == 1 (
-    	echo Error compiling less code
+    	rem
     )
 ) || (
 	echo ERROR:

css/weather-icons.css

@@ -742,7 +742,7 @@
 }
 .wi-wmo4680-0:before,
 .wi-wmo4680-00:before {
-  content: ' ';
+  content: "\f055";
 }
 .wi-wmo4680-1:before,
 .wi-wmo4680-01:before {
@@ -750,7 +750,7 @@
 }
 .wi-wmo4680-2:before,
 .wi-wmo4680-02:before {
-  content: ' ';
+  content: "\f055";
 }
 .wi-wmo4680-3:before,
 .wi-wmo4680-03:before {

weather-icons/icon-classes-wmo4680.less

@@ -5,11 +5,11 @@
 // http://www.wmo.int/pages/prog/www/WMOCodes/WMO306_vI1/VolumeI.1.html
 
 .@{weather-icons-prefix}-wmo4680-0:before,
-.@{weather-icons-prefix}-wmo4680-00:before       { content: ' '                    ; }
+.@{weather-icons-prefix}-wmo4680-00:before       { content: @thermometer           ; }
 .@{weather-icons-prefix}-wmo4680-1:before,
 .@{weather-icons-prefix}-wmo4680-01:before       { content: @cloudy                ; }
 .@{weather-icons-prefix}-wmo4680-2:before,
-.@{weather-icons-prefix}-wmo4680-02:before       { content: ' '                    ; }
+.@{weather-icons-prefix}-wmo4680-02:before       { content: @thermometer           ; }
 .@{weather-icons-prefix}-wmo4680-3:before,
 .@{weather-icons-prefix}-wmo4680-03:before       { content: @cloudy                ; }
 .@{weather-icons-prefix}-wmo4680-4:before,