don't try to copy git repos twice
run written gemspecs only at install-time
return a GitReader from update_git
rename serialize method for clearer intent
match up test name with other gemspec-caching test
fix gemspec caching during bundle cache
Revert "Use canonical gem source"

The symbol :rubygems is converted to a URL without https. We want to make the
default source supplied by Bundler use HTTPS. Unfortunately, we can't change
the canonical source from HTTP to HTTPS and maintain backwards compatibility.

This reverts commit 9df4ff9e2a82380a4e4c924684cab0bbd26d4212.
fix dep name, add version constraint
fix version constraints, clean up git in gemspec