Add max thumbnail methods replicating existing functionality.
Switch format from m900l to 900lm for easier casting to int.
Use 900mw for 900 max width instead of 900wm.
Add the logic. Only call thumbnailImage if the thumbnail will be smaller.
Add new methods to the documentation.
Merge remote-tracking branch 'upstream/master' into thumbnail-max-methods
Add new methods to the php resizing functionality.
Add logic to php resize functions.
Merge pull request #164 from chmac/thumbnail-max-methods

Add three new thumbnail methods