Release Name: 1.1

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 1.1

* changes and fixes:
  - fix documentation here and there
  - make sure all defined #to_s methods handle recursion
  - defined Module#cached_enum: returns an Enumerator method for
    a "each_" method, cachin the enumerator object. Works also
    for iteration with one argument (caching one Enumerator by
    argument)
  - fix Time.from_hms when the millisecond field has leading zeroes
  - optimizations here and there:
    * Array#to_value_set does not rely on rb_iterate
    * specific implementation of ValueSet#dup
    * more generally, avoid object allocation where possible
  - ColumnFormatter object: formats CSV output for display