Release 1.0

@bmuschko: please review and merge.

- Updates the configuration options to the current Google Charts API. Important! This might introduce some backward compatibility issues as some parameters have been removed, replaced or have changed type. Eg: tooltipText and tooltipTextStyle replaced by tooltip of type object, ... (This will be noted in the README.md file and the [changelog wiki page](https://github.com/bmuschko/grails-google-visualization/wiki/changelog))
- Removed support for Image Charts as they are no longer part of the Google Charts API
- Now the object type can be declared using the Map notation as the preferred option instead of using an Expando object declaration. It still can be used though to avoid backward compatibility issues. Eg:
```gsp
legend="${[position: 'top', alignment: 'center']}"
```
instead of:
```gsp
legend="${new Expando(position: 'top', alignment: 'center')}"
```
- Replaced scriptlets with EL expressions in javascript template.
- Fixes issue #15 (Special mention needs to be done in the documentation).
- Fixes issue #37 providing examples and unit tests.

Additionally documentation has been moved and updated from the [Grails plugin portal](http://grails.org/plugin/google-visualization) to the [GitHub project WIKI space](https://github.com/bmuschko/grails-google-visualization/wiki) in Markdown format.

I think that after you have done the code review and approved the merge, we are ready to publish the new release.
Cheers