Fix writing of tiff description

toCharArray() is the same as getBytes('UTF-16BE')
This leads to have unicode for units not being
correctly encoded.
Add test checking that the reader used is the OME-TIFF reader.
Add doc.
Add bash script for updating copyright headers

This script is largely inspired from a Request from Curtis Rueden and should
be called with a positional argument equal to the current year, e.g.
$ bash tools/update_copyright 2015
Split pattern
Add logic to update single year copyrights
Attempt to fix sed issue
Add check for copyright year arguments
Merge pull request #1462 from sbesson/copyright_tools

Add bash script for updating copyright headers
Merge pull request #1459 from jburel/encoding

Fix writing of tiff description