Misc tweaks

- Use JHtml to initialise JavaScript
- Modify JHtmlBootstrap::carousel() to allow the selector param to specify class or id
- Missing closing </div>
Merge pull request #3 from janich/modules-gsoc

Language strings
Merge pull request #2 from mbabker/modules-gsoc

Misc tweaks
Added Image Slider parameters to control autostart, navigation and controls
Added Image Slider id, to allow multiple sliders on one page
Small bugfix's and formatting