Add IE7 fixes to template

* Fix IE7 as best we can, based on
https://github.com/coliff/bootstrap-ie7
  * Add comments to explain fixes
* Linearises grid
* Fixes glyphicon font
* Fixes small layout issues mostly by applying hasLayout
Fix bootstrap 3 breadcrumbs and nav tabs in IE7

* Clear nav tab container
* Remove breadcrumb indent and render crumbs inline
Normalise IE7 CSS

* Include common CSS resets for peculiar IE7 behaviour, as pulled from
version 1 of normalise:
https://github.com/necolas/normalize.css/blob/v1/normalize.css
* Reduce Bootstrap 3 button height to stay consistent
Fix text input heights in IE7
Fix alignment of checkboxes in IE7
Merge pull request #29 from alphagov/ie7-shim

Improve Bootstrap 3 styles in IE7