tests: add gemfiles for dalli 1.1.x and 2.x
Support older dalli client versions
Support a Dalli Connection Pool
Handle older Dalli clients
Merge branch 'patch-2' into patch-3

Conflicts:
	lib/rack/attack/store_proxy.rb
Merge branch 'master' into patch-3
Merge remote-tracking branch 'upstream/dalli_versions' into patch-3
Ignore binstubs
Use Appraisal to test against multiple versions
Stub #with on delegator
Move offline case to separate file
Move individual proxy classes to separate files
Don't memoize in test

I don’t think this has any side effect, but still…
Integration tests: use 127.0.0.1 instead of localhost
Merge branch 'pr57'

Closes #57