Release Name: 0.2.2

Notes:
== What is Utilrb ?
Utilrb is yet another Ruby toolkit, in the spirit of facets. It includes all
the standard class extensions I use in my own projects like Genom.rb.

== Utilrb's C extension
Utilrb includes a C extension in ext/. It is optional, but some of the
functionalities will be disabled if it is not present. Trying to require
a file in which there is a C-only feature will yield a warning on STDOUT.

* some features have a Ruby version, but a C version is provided for
  performance:
  - Enumerable#each_uniq

* some features are C-only
  - ValueSet class
  - Kernel#swap!


Changes:
=== Version 0.2.2
The "don't forget to bump version number" release. 0.2 was supposed to be 0.2.1

 * new features:
    - Queue#get: waits for the queue to be not empty and returns all elements at 
      once. A non_block parameter is given which makes get() return [] if the
      queue is empty