Added continent of 'Central America'.

Added continent of 'Central America'.
Added continent of 'Central America'.

Added continent of 'Central America'.
Added continent of 'Central America'.

Added continent of 'Central America'.
Added continent of 'Central America'.

Added continent of 'Central America'.
Added continent of 'Central America'.

Added continent of 'Central America'.
Added continent of 'Central America'.

Added continent of 'Central America'.
Create CostaRica.class.php

Create CostaRica.class.php
Merge pull request #109 from twindual/master

Added continent of 'Central America' and the country plugin for Costa Rica.