Finalizing 0.5.6 release.
Merge branch 'release-0.5.6'
Merge branch 'master' into devel
Added __repr__ for JPEG2000SignatureBox, FileTypeBox.
added __repr__ for colr, cdef, ihdr boxes.  #133
Added jp2h __repr__ method.  #133
Added support for jplh, jpch, cmap, res , resd, resc  #133
Added 'url ', 'lbl ' box support.  #133
Added ulst and uinf repr support.  #133
Proper repr support for SIZ segment.  SIZ segment constructor change.

The SIZ segment was taking raw buffer arguments, which are difficult
for eval(repr()) to deal with, so the constructor was changed to make
the arguments more explicit. #133
Added repr support for Jp2k class.  #133
Added proper repr support for association box.  #133
Added palette and xml box repr support.  #133
Regexp tests can only run on 2.7 and 3.3.  #133
Added rreg repr support.  #133
Added UUIDBox and ContiguousCodeStreamBox repr support.  Closes #133
Merge branch 'issue133' into devel
Merge branch 'devel' of github.com:quintusdias/glymur into devel