ImageConverter: fix dimensions of the last tile

Suggested by Kristian Kjaergaard on the ome-users mailing list:

http://lists.openmicroscopy.org.uk/pipermail/ome-users/2013-September/003940.html

If the width (or height) of the image is evenly divisible by the tile
width (or height), the previous behavior was to set the width (or
height) of the last tile to be converted to 0.
OME-TIFF: prevent AIOOB exception when writing tiles to an OME-TIFF
ND2: only populate the channel color if it is non-zero

Setting the channel color to 0 (i.e. black) can prevent the images from
displaying correctly when the color-appropriate lookup tables are applied.
fix SimplePCI links in documentation
Merge pull request #719 from mtbc/fix-simplepci-link

fix SimplePCI links in documentation
Merge pull request #717 from melissalinkert/nd2-channel-color

ND2: only populate the channel color if it is non-zero
Merge pull request #711 from melissalinkert/from-kristian-kjaergaard

ImageConverter: fix dimensions of the last tile