A few minor tweaks.
Reorganize some specs.
Make collection type gettable and settable.
Check that the value for :collection is valid when it is set.
Minor reorganization.
Make maximum_size dynamically configurable, and some other cleanup.
Make zero a legitimate maximum_size.
Support a dynamic maximum_size.
Allow the timeout to be set dynamically.
Handle options erroneously set to nil when instantiating Pond.
Reorganize specs some more.
Tweak the README.
Add CHANGELOG.
Bump version to 0.1.0 for initial release.