remove LC_ALL default environment variable

now that we no longer support ruby 1.8.7 its time to retire this
control ENV['LC_ALL'] global better

fixes travis failure that did not fail on my desktop
bumping version to 2.0.0.rc.0
dump out changelog for 2.0.0 and add LC_ALL entry
add back 'last-release' stuff
add required ruby version
Merge pull request #58 from opscode/lcg/remove-lc-all-hack

remove LC_ALL default environment variable