Issue #31 Refresh time format on render
Issue #31 only play with upvotes when user in

There should be no attempt to change upvotes on put when there is no
user signed in.
Issue #31 Add limits on left right image movement

Limit add method to calculate limit of x movement.
Use setPosition method of model to set positions via the module.
Limit sideways movement and replace invalid values with maximum and minimum values.
Issue #31 Limit image vertical position

Add limit to the movement of images in the y direction
Issue #31 Sinch up test case boundaries

Design test cases to test the speific limits of the image sizes.
Issue #31 Refactor calcs of image size limits

Don't chop of borders at the start of the calculation anymore, use
them as part of the boundaries.
Issue #31 Remove obsolete defaults

Remove original_width and original_height from image trimmer model.
Issue #31 Prevent sliding if image is not ready
Issue #31 Use size method instead of setting slider
Issue #31 Clear image before new image

When changing to a new image, clear the image model first