Display spring version in the help message
Merge pull request #200 from Florent2/display-version

Display spring version in the help message
Update readme
Workaround sporadic SSL errors in tests
Add another SSL error workaround
Get rid of our Rubygems performance workaround

This is fortunately no longer necessary with Rubygems 2.1.0 if all the
gemspecs have been regenerated. Warn the user if those conditions are
not met.

Closes #189.
Fall back to non-spring execution when spring gem missing

Fixes #192
Fix binstubs test
Update OkJson
Update the ENV on each run

Fixes #176
Support specifying rails env after rake command

Fixes #179
Ensure the io is created before the thread

There was an odd failure of this test:
https://travis-ci.org/jonleighton/spring/jobs/12755629

I'm not sure if this will help, but it seems sensible anyway.
Allow configuring default rake task environment

Fixes #180
Move rspec and cucumber commands out to gems

Closes #164
Bundler compatibility

Bundler overwrites Gem::Specification.stubs such that it returns
Gem::Specification instances rather than Gem::StubSpecification
instances.

Fixes #202
Revise readme
tweak readme
bump version to 0.9.0
Remove anti-eager-load hack

Rails 4 has a config.eager_load setting allowing the user to decide if
they want an environment to eager load or not. Let's just respect this
rather than potentially cause surprises.
Don't overwrite env vars created during boot

Fixes #204