Greek Language Translation (chriskacerguis#696)

Merge pull request chriskacerguis#523 from ivantcholakov/master

Summary updates and adding simple pages for quick test

fixes chriskacerguis#344

whitespace fix

Added changelog.

Tagged 2.6.0.

Updated README with Changelog.

Fixed spelling mistake.

Changed readme for v2.3.

Merge branch 'master' of github.com:philsturgeon/codeigniter-restserver