Remove >= 0.7.3 gem dependency; this works with older ruby-prof also.
Remove >= 0.7.3 gem dependency; this works with older ruby-prof also.

12spokes/rack-contrib,gferguson-gd/rack-contrib,tobiashm/rack-contrib,vivrass/rack-contrib,edmorley/rack-contrib,vivrass/rack-contrib,gferguson-gd/rack-contrib,tobiashm/rack-contrib,edmorley/rack-contrib,bradgessler/rack-contrib