Refactor content blocks to ignore lines

We can simplify our previous standalone determination logic by merging content blocks again.

Fixes #854

src/handlebars.l

@@ -28,7 +28,7 @@ ID    [^\s!"#%-,\.\/;->@\[-\^`\{-~]+/{LOOKAHEAD}
 
 %%
 
-[^\x00\n]*?\n?/("{{")           {
+[^\x00]*?/("{{")                {
                                    if(yytext.slice(-2) === "\\\\") {
                                      strip(0,1);
                                      this.begin("mu");
@@ -41,7 +41,7 @@ ID    [^\s!"#%-,\.\/;->@\[-\^`\{-~]+/{LOOKAHEAD}
                                    if(yytext) return 'CONTENT';
                                  }
 
-([^\x00\n]+\n?|\n)               return 'CONTENT';
+[^\x00]+                         return 'CONTENT';
 
 // marks CONTENT up to the next mustache or escaped mustache
 <emu>[^\x00]{2,}?/("{{"|"\\{{"|"\\\\{{"|<<EOF>>) {