add ability to record multiple videos in one session
ui improvements
Merge branch 'scrollview'

Conflicts:
	GPUVideo.xcodeproj/project.xcworkspace/xcuserdata/seanwertheim.xcuserdatad/UserInterfaceState.xcuserstate
	GPUVideo.xcodeproj/xcuserdata/seanwertheim.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist
ui improvements
add buffering time for preview
Merge branch 'master' of https://github.com/swerty/GPUVideo
update readme