Prepare for v1.1.0 release

- Rewrite the README entirely with new installation instructions
- Tweak the styling in CONTRIBUTING.md and CHANGELOG.md

CHANGELOG.md

@@ -1,12 +1,14 @@
-# Change Log
+# Changelog
 
 All notable changes to this project will be documented in this file.
 
-The format is based on [Keep a Changelog](http://keepachangelog.com/)
-and this project adheres to [Semantic Versioning](http://semver.org/).
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+## [1.1.0] - 2017-10-04
+
 ### Added
 
 - 3 new node shapes in the circular saw (thin slabs, available in
@@ -23,7 +25,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   - Straw
   - Tin Block
   - Wool (all colors)
+- Other mods can now get a list of all the defined Stairs+ shapes
 
 ## [1.0.0] - 2017-02-19
 
 - Initial versioned release.
+
+[1.1.0]: https://github.com/minetest-mods/moreblocks/compare/v1.0.0...v1.1.0
+[Unreleased]: https://github.com/minetest-mods/moreblocks/compare/v1.0.0...HEAD