Fixed Configuration section.
No longer mention the --vendor option.
Link to PGP.
Change name to gem_home.
Set test_ruby_api_version.
Test gem_home_push and gem_home_pop.
Make the individual tests executable.
Load gem_home.sh.
Don't use RUBY_ROOT.
Got the assert arguments reversed.
Split tests apart.
Streamline the code and always set GEM_HOME to $PWD/.gem/...
Combined the gem_home_push tests together.