Somewhat working viewport settings for ios7 HSWA

 * Adds "hack framework" for initializing various devices/browser spesific issues
 * Adds webkitvariant property for ios7 home screen web apps
 * Adds viewport hack, similar to the one in ios7hotfixes, for ios7 home screen web apps

IMO this kind of short term hacks should not be added to the product for multiple reasons, but adding this anyway for review. I'll let those decide who want to decide :-)

Change-Id: I8fcddd3e63c8f87ea9f4e7aeb9cd7cc670e5acbe
Merge branch '3.0'

Merged: Somewhat working viewport settings for ios7 HSWA

Change-Id: I3ab9c6c444d54f0a990c911517aa20e964d60f53