removeAllChildren for iOS and android
removeChildren: wasn't in may thread. Have to make sure children array is locked before touching it!
do not call remove in removeAllChildren
Merge branch 'master' of https://github.com/appcelerator/titanium_mobile into TC-1193
Fixed backgroundLeftCap and backgroundTopCap for label
removeAllChildren: renaming and better comments
label backgroundImage now respects view backgroundImage behaviour, and still works with backgroundPadding

Conflicts:
	iphone/Classes/TiUILabel.h
	iphone/Classes/TiUILabel.m
[TIDOC-823] Initial XML markup examples
[TIDOC-823] Add Android Menu.
[TIDOC-823] Added OptionDialog example
Merge remote-tracking branch 'upstream/master' into tidoc-823
TIDOC-692 Updated docs for html, setHtml
TIDOC-692 Semicolon!
Merge remote-tracking branch 'arthurevans/tidoc-835' into tidoc-835
Merge remote-tracking branch 'upstream/master' into tidoc-829
[TIMOB-10891] Delete Dead Code
[TIMOB-10891] Tabs will not retain tabGroup. TabGroup retains tabs
[TIMOB-10486]Do not handle rotation, if don't own it.
[TIMOB-10891] Remove unrequired retains
[TIMOB-10891] Respect animated flag of NavController when closing