Remove legacy less engine registration

Author: rndev15

README.md

@@ -902,7 +902,6 @@ Supported engines:
 | css: | none | Shortcut | Shortcut to embed css code and wrap in style tag |
 | sass: | sass-embedded or sassc or sass | Compile time | Embed sass code and wrap in style tag |
 | scss: | sass-embedded or sassc or sass | Compile time | Embed scss code and wrap in style tag |
-| less: | less | Compile time | Embed less css code and wrap in style tag |
 | coffee: | coffee-script | Compile time | Compile coffee script code and wrap in script tag |
 | markdown: | redcarpet/rdiscount/kramdown | Compile time + Interpolation | Compile markdown code and interpolate #\{variables} in text |
 | textile: | redcloth | Compile time + Interpolation | Compile textile code and interpolate #\{variables} in text |

lib/slim/embedded.rb

@@ -234,7 +234,6 @@ def on_slim_embedded(engine, body, attrs)
 
     # These engines are executed at compile time
     register :coffee,     JavaScriptEngine,                engine: TiltEngine
-    register :less,       TagEngine,          tag: :style, engine: TiltEngine
     register :sass,       TagEngine, :pretty, tag: :style, engine: SassEngine
     register :scss,       TagEngine, :pretty, tag: :style, engine: SassEngine