Check for correct keywords in wrapDirection property. Fix #165
Add lineAlign property to HSSDisplayObject
HSSObject: make getController() const
HSSObject: Make setScope() virtual to enable overriding from subclasses
HSSDisplayObject: Add getters for innerWidth and innerHeight
Add basic HSSLayoutLine class

This will be the replacement for HSSContainer::displayGroup
Add reverse iterating to HSSSimpleSelection
Move arrange and distribute functions to HSSLayoutLine

These position the individual elements in a line in the primary direction
Move overlapping detection functions into HSSLayoutLine
Remove the old layout code from HSSContainer
Add new layout code
Add some property name comments to make the code more consistent
HSSDisplayObject: Register inner and outer width/height properties
Trim trailing whitespace
Only recreate the frame when something actually changed
Add code in preparation for width by content
Clear observers in case they don't get removed at a later stage
Fix issues with observing and expressions
Floor observed anchor values
Return correct value in getDAlignY