Merge branch 'release/v0.2.2' into develop

* Package documentation maintenance.
* Changed GA population size and generations to speed up default GA runs.
Added previous 0.2.2 changes to HISTORY
Corrected date of most recent log in HISTORY
Fixed breaking python 2.6 build
Update to version v0.2.3
Merge branch 'release/v0.2.3'

Fixed breaking python 2.6 build