[FIX] sap.m.SegmentedButton removed icon and text restriction

This fix removes a restriction that was introduced by UX specification.
After re-discussing this functionality we decided to open up the API to
use either Icon, Text, or Icon+Text for the Buttons.

Change-Id: Iedddeeb001c462da951d80ee436354d4626944ad
[INTERNAL][FIX] configured demokit navigation to only show 2 levels

This change configured the developer guide tree to only show 2 levels of
documentation intially. It is easier to browse and access this way.

Change-Id: I622b152d0339ba3eb7f6a017b008430f4d10e09c
[FIX] sap.m.Input remove initial flickering due to resize behavior

This fix remvoes a flickering effect, that occured because the
suggestion popup is loaded with the wrong size initially.

Change-Id: I842d01865a300bbc6836125ad849c7dde13bdba3
CSN: 0120031469 0000767911 2014
Merge "[FIX] sap.m.SegmentedButton removed icon and text restriction"
Merge "[INTERNAL][FIX] configured demokit navigation to only show 2 levels"
Merge "[FIX] sap.m.Input remove initial flickering due to resize behavior"