Support graphite identifiers with embedded colons. i.e.…

Support graphite identifiers with embedded colons. i.e. host:twiggy.servlet:home.method:GET.user:loggedin.50th

src/app/services/graphite/lexer.js

@@ -122,6 +122,7 @@ define([
       i === 95 ||           // _
       i === 95 ||           // _
       i === 45 ||           // -
       i === 45 ||           // -
       i === 42 ||           // *
       i === 42 ||           // *
+      i === 58 ||           // :
       i >= 97 && i <= 122;  // a-z
       i >= 97 && i <= 122;  // a-z
   }
   }