missing "else" in resize-to-fit

if the image resized to fit the square exactly, top/left would not be
set, causing an exception
Merge pull request #7 from stanislaw/master

Fix to build on travis again (fixes #6)
Merge git://github.com/jcupitt/carrierwave-vips
Removes ignores that should be system-wide.
Removes cruft code.
Bumps gem version
Adds pending test for exact dimensions.
Adds test.
Bug Fix:

Previously, when resize_image was called, it would re-read the image
from disk (adding the amount of shrink, and setting :sequential to true).
This caused previous manipulations to be erased; this was especially
problematic when trying to crop a photo using extract area.

This may not be the best fix, but it works. I was unable to find a method
to set :sequential to true in ruby-vips; perhaps I just didnt look hard
enough.
Puts image loading back in manipulate! Removes cruft in resize_image
Version bump
small change to build 1.8.7 on travis