Handle installing a gem from a local file.

[ryansch]

This allows me to grab a gem file from a anywhere (cookbook, s3, etc), pop it into /tmp, and install it with:

rvm_gem "json" do
  source "/tmp/json-1.5.1.gem"
  version "1.5.1"
  ruby_string "ree@project"
end

[fnichol]

Looks great, thanks!!

[lock]

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