#3 Update hexrgb.el to a more recent version

[Oleg Kostyuchenko]

Hi,
Please update hexrgb.el, for emacs-jabber still uses 2009 version.
In general, there is no harm in this, but it still can break some other plugins' functionality. For instance, if Icicles plugin discovers hexrgb (which is optional for Icicles) on startup, it tries to use its "advanced" functions like hexrgb-increment-value and fails, for they are missing in the version provided by emacs-jabber.

Thanks in advance.