Six rhodopsin genes as FASTA file.

Also used in the BLAST+ Galaxy wrapper tests, see:
https://github.com/peterjc/galaxy_blast/blob/master/test-data/rhodopsin_nucs.fasta
PNG header in dummy file for use in testing.

$ python
Python 2.6.6 (r266:84292, Jan 22 2014, 09:42:36)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> magic = "".join(chr(x) for x in [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a])
>>> with open("test-data/magic.png", "w") as h: h.write(magic)
...

Plan is to use this with the "contains" comparison offered by
the Galaxy test framework.
Start of a v1.4 PDF file (for use with unit tests)
Include mummerplot test case
Try to test mummerplot on TravisCI