Modified the exportImage figure to allow the user to export multiple slices in either one file (as a montage) or in separate files. The images also export in their original size, and the correct image extensions are listed for the "imwrite" MATLAB function. The standard OS file/directory window now allows you to choose the folder that you want to save to.
Fixed a bug with "applyColormapToImage" caused by a rounding error (ceil of 1.000000000001 is 2).
Fixed a bug in the slice slider that was causing two timers to run at the same time. This should hopefully stop all slider-related crashes and error messages.