Added several unconstrained functions.
Merge pull request #110 from robgarden/newFunctions

Additional unconstrained functions.
General changes related to spelling and class locations.

* Moved some classes to more appropriate packages/subpackages.
* Changed spelling of some classes to British spelling.
* Made population based algorithms more consistent wrt the common super class.
* Removed/integrated some unnecessary classes.
* Fixed some implementation errors in some iteration strategies.

Signed-off-by: Gary Pamparà <gpampara@gmail.com>