Added iBeacon example.
All examples: Removed viewport meta-tag attribute part 'target-densitydpi=device-dpi'
Changed header's height- & margin units from percent to em (relative font size). Adjusted header's default button size.
ble-ti-sensortag: added automatic scaling of graph.
Updated design of and renamed beacon example.
Renamed folder beacon-scan to ibeacon-scan and title from 'Beacon scan' to 'iBeacon scan'.
Updated design of ble-scan example and changed selector 'ul.clickable' to 'ul.dynamic' in common stylesheet.