Backwards compatability for ruby 1.9.3 (fixes #1)

The OpenStruct class changed in 2.0, so you could access it as if it
were a hash. This commit reverts to the old syntax (dot access only) so
that poole works ruby 1.9.3.
Version bump to 0.2.2.
Merged into 'mmcclimon/master'
added changes for v3 to changelog