Added navPosition to devide wether to palce the nav before or after the flipster.
Added prevtext and nexttext to change the default text for the navigation buttons
Small edit, forgot a ">"
Removed Navigation positioning because of some strange errors. WEill investigate in the future.
re-added navPosition, the errors were thrown by my CMS
Merge pull request #29 from FFeliziani/navOptimization

Added prevtext and nexttext to change the default text for the navigation buttons