fix 'destroy' method to remove -before and -after item duplicates
add addItem method to lemmonSlider:
allow lemmonSlider to accept options
add 'addItem' method that accepts an html string to append to page;
add options under addItem to prepend or append element;
support addItems for both infinite: true; and infinite: false; runtimes
remove trash
fix single pixel rounding error on nextPage and nextSlide:
sometimes, lemmonSlider cannot loop on nextPage and nextSlide because of a 1 px rounding error on nextPage and nextSlide;
Merge pull request #7 from joshuaballoch/add

Add 'addItems' function to Lemmon-Slider