Update documentation footer for 2017
Tested-by: Mark Nunberg
<ul>
$navpath
<li class="footer">
- <b>Copyright 2010-2014, Couchbase Inc.</b>
+ <b>Copyright 2010-2017, Couchbase Inc.</b>
$generatedby
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="$relpath$doxygen.png" alt="doxygen"/></a> $doxygenversion </li>
