Correct model when capturing landscape

The script capture.js might choose the wrong model when in landscape mode. This is because the model is determined from the height of the image. In landscape mode the height will always be 320 on iPhone, so a 4" landscape image will be saved as 3.5". 
The fix takes the orientation into account when looking for the 4" model.
Rotate landscape Images 90°

Rotate all landscape images by 90° to get the right orientation of the image. 
sips is part of Mac OS X.
Might be that the syntax of the command can be improved. I don't know if all those backslashes and curly braces are necessary.
Merge pull request #37 from wayfaerer/master

Fix for model determination and rotating landscape images