Update naming for better mailing list announcement

By now, when we release the plugin, users can be confused about version naming.

For example, email title could be:

```
[ANN] Japanese (kuromoji) Analysis plugin for elasticsearch 1.8.0 released
```

We prefer to have that form:

```
[ANN] Elasticsearch Japanese (kuromoji) Analysis plugin 1.8.0 released
```

Thanks to @spinscale to reporting this.
fix typos in README.md

Closes #23
Added plug-in test hooks
Adjusted local repository policy

When running plugin test, set local repository update policy to always.
Add plugin version in es-plugin.properties

With https://github.com/elasticsearch/elasticsearch/issues/2784, we can now add plugin version in `es-plugin.properties` file.

It will only be used with elasticsearch 1.0.0 and upper. No need to push it in 1.x branch.

Closes #26.
Disable java and maven version checking

And fix typo in email html
Update master to elasticsearch master SNAPSHOT
Check elasticsearch version SNAPSHOT dependency
Manage per version documentation links