Docs: make the welcome page more obvious

Closes #25.

.gitignore

@@ -9,3 +9,4 @@
 /.classpath
 /.settings
 .local-execution-hints.log
+/plugin_tools

README.md

@@ -3,23 +3,32 @@ JavaScript lang Plugin for Elasticsearch
 
 The JavaScript language plugin allows to have `javascript` (or `js`) as the language of scripts to execute.
 
-In order to install the plugin, simply run: `bin/plugin -install elasticsearch/elasticsearch-lang-javascript/2.1.0`.
+In order to install the plugin, simply run: 
 
-* For master elasticsearch versions, look at [master branch](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/master).
-* For 1.4.x elasticsearch versions, look at [es-1.4 branch](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/es-1.4).
-* For 1.3.x elasticsearch versions, look at [es-1.3 branch](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/es-1.3).
-* For 1.2.x elasticsearch versions, look at [es-1.2 branch](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/es-1.2).
-* For 1.1.x elasticsearch versions, look at [es-1.1 branch](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/es-1.1).
-* For 1.0.x elasticsearch versions, look at [es-1.0 branch](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/es-1.0).
-* For 0.90.x elasticsearch versions, look at [es-0.90 branch](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/es-0.90).
+```sh
+bin/plugin -install elasticsearch/elasticsearch-lang-javascript/2.3.0
+```
+
+You need to install a version matching your Elasticsearch version:
 
-|   JavaScript Lang Plugin    |    elasticsearch    |  rhino   | Release date |
-|-----------------------------|---------------------|----------|:------------:|
-| 3.0.0-SNAPSHOT              | master              |  1.7R4   |  XXXX-XX-XX  |
+| elasticsearch |   JavaScript Plugin   |   Docs     |  
+|---------------|-----------------------|------------|
+| master        |  Build from source    | See below  |
+| es-1.x        |  Build from source    | [2.4.0-SNAPSHOT](https://github.com/elasticsearch/elasticsearch-transport-thrift/tree/es-1.x/#version-240-snapshot-for-elasticsearch-1x)  |
+| es-1.3        |  2.3.0                | [2.3.0](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/v2.3.0/#javascript-lang-plugin-for-elasticsearch)  |
+| es-1.2        |  2.2.0                | [2.2.0](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/v2.2.0/#javascript-lang-plugin-for-elasticsearch)  |
+| es-1.1        |  2.1.0                | [2.1.0](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/v2.1.0/#javascript-lang-plugin-for-elasticsearch)  |
+| es-1.0        |  2.0.0                | [2.0.0](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/v2.0.0/#javascript-lang-plugin-for-elasticsearch)  |
+| es-0.90       |  1.4.0                | [1.4.0](https://github.com/elasticsearch/elasticsearch-lang-javascript/tree/v1.4.0/#javascript-lang-plugin-for-elasticsearch)  |
 
-Please read documentation relative to the version you are using:
+To build a `SNAPSHOT` version, you need to build it with Maven:
+
+```bash
+mvn clean install
+plugin --install lang-javascript \
+       --url file:target/releases/elasticsearch-lang-javascript-X.X.X-SNAPSHOT.zip
+```
 
-* [3.0.0-SNAPSHOT](https://github.com/elasticsearch/elasticsearch-lang-javascript/blob/master/README.md)
 
 Using javascript with function_score
 ------------------------------------