Log Message:
Update to 6.9.1-7:

2015-07-04  6.9.1-7 Cristy  <quetzlzacatenango@image...>
  * New version 6.9.1-7, SVN revision 19121.

2015-06-27  6.9.1-7 Eric Dalquist
  * Fixed and escaped output of the json coder. (reference
    http://www.imagemagick.org/discourse-server/viewtopic.php?f=3&p=27894).

2015-06-25  6.9.1-7 Cristy  <quetzlzacatenango@image...>
  * Support BPG image format (respects -quality option).
  * A bordered transparent image now remains transparent (reference
    http://www.imagemagick.org/discourse-server/viewtopic.php?f=5&t=27937).
  * The -update option behavior restored (reference
    http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=27939).