acu176592 relaxed gem constraints for downstream gems
removed support for ruby 1.8, gems can use right_develop < 3.0 if necessary
removed legacy debugger logic pending rethink of ruby 2.1 debugger needs
v3.0.0
acu176592 debugger gems in development group
newer versions of rubygems should see them as development dependencies
Merge pull request #21 from rightscale/sapphire_14_15_acu176592_relax_gem_constraints

 sapphire_14_15_acu176592_relax_gem_constraints