forced predefined widths to also enforce minimum width rules
quickfix for gap that appears during scrolling

bug noticed on Firefox (didn't try on other browsers)
added idle class to all world sectors

this allows for the "cascade building" effect of levels to be possible
deleted unused graphics
added new buildings images for paris level sprites
new graphics for usineio level
new graphics for posts
quickfix : Mac-only horizontal scrolling workaround
auto animate metro sprite (runner-type sprites)
reorganized world layers zindexes, added new layers
added new buildings sprites in paris level
changed paris level rules to be cross-layers
usineio level changes in colors and sprites
added new background layer for city-scape
added new posts layer above everything else for posts excerpts
removed landing zone labels, adjusted some sectors and sprites