When an image was added via Atto and it was set to resize automatically
if the alignment was set to Top, Middle or Bottom when it was made
smaller then a vertical scroll bar would be displayed.
This was caused by the interaction of the margin settings on the image
and the 100% width set via the img-responsive css class. The width of
an element only includes the content area and not any borders, padding
or margins.
This change stops atto hardcoding the styles for image alignment into
the images style tag, it instead adds a class that defines the alignment
the image should have.
This change has the benefit that themers will now be able to adjust
how atto image alignments work if they wish.
Images added before this patch will continue to have the issue
until they are edited by the plugin, at which time their legacy style
will be removed and the new alignment method will be added.
Thanks to Andrew Nicols who provided a refactor for the Alignment
and style detection code.
Neill Magill
b9143c7883