Disable minifying by default (#10812)

The yuicompressor used for minifying sometimes produces broken
output and is not compatible with the sprite support in Vaadin
framework builds, so set the default value for minifying
"false".

Change-Id: Ida05318a7f882564021a5d953cc134b4265f6ae9

Author: Henri Sara

src/main/java/com/vaadin/sass/SassCompiler.java

@@ -51,7 +51,7 @@ public static void main(String[] args) throws Exception {
                 .defaultValue("mixed").help("Set URL handling mode");
 
         argp.defineOption("minify").values("true", "false")
-                .defaultValue("true")
+                .defaultValue("false")
                 .help("Minify the compiled CSS with YUI Compressor");
 
         argp.defineOption("compress").values("true", "false")