Further tidying of README

Author: dch0ph

README.md

@@ -4,9 +4,7 @@
 
 It is useful for building parsers, tests, compilers, and syntax highlighting/checking for languages.
 
-[![Build Status](https://travis-ci.org/mapnik/mapnik-reference.svg)](https://travis-ci.org/mapnik/mapnik-reference)
-
-Default branch is `gh-pages` which is displayed at http://mapnik.org/mapnik-reference
+Default branch is `gh-pages`, which is displayed at http://mapnik.org/mapnik-reference
 
 ## Versioning
 
@@ -25,7 +23,7 @@ The structure of `reference.json` is:
 * `version`: the version of Mapnik targeted. Same as the containing directory.
 * `style`: properties of the `Style` XML element
 * `layer`: properties of the `Layer` XML element
-* `symbolizers/*`: properties that apply to **all** symbolizers
+* `symbolizers`: properties that apply to all symbolizers (removed from version 2.1.0 onwards)
 * `symbolizers/`_\<symbolizer\>_: properties that are specific to a given symbolizer
 * `colors`: named colors supported by Mapnik. see `include/mapnik/css_color_grammar.hpp`
 
@@ -84,4 +82,4 @@ Tests require python and node.js:
 ## Users
 
 * [carto.js](https://github.com/cartocss/carto)
-* Mapnik itself (the utility [mapnik-reference-validate.py](https://gist.github.com/springmeyer/3410845) can be used to check binding consistency like in [#1427](https://github.com/mapnik/mapnik/issues/1427))
+* [Mapnik documentation](http://mapnik.org/mapnik-reference)