New widget positions and templates

- Added widgets: Several new widget positions, some with Bootstrap
Jumbotron. See screenshot_widget_positions.gif
- Added templates: Frontpage and About us. Use these with widgets to
achieve greater variations between pages of your site
- Added css: Couple classes to markup for handy hooks such as "main"
column, and a couple generic css rules
Merge pull request #4 from ccondrup/master

Merged Pull request by ccondrup:

- Added widgets: Several new widget positions, some with Bootstrap Jumbotron. See screenshot_widget_positions.gif
- Added templates: Frontpage and About us. Use these with widgets to achieve greater variations between pages of your site
- Added css: Couple classes to markup for handy hooks such as "main" column, and a couple generic css rules