Update copyright dates for 2015

[asmecher]

Done for OJS master, ojs-dev-2_4, OMP master, and omp-dev-1_1. Will do others as/when needed.

A useful script for next time:

sed -i  --follow-symlinks \
        -e "s/-2014 Simon Fraser University Library/-2015 Simon Fraser University Library/" \
        -e "s/2014 Simon Fraser University Library/2014-2015 Simon Fraser University Library/" \
        -e "s/-2014 John Willinsky/-2015 John Willinsky/" \
        -e "s/2014 John Willinsky/2014-2015 John Willinsky/" \
        `find . -name \*.tpl` \
        `find . -name \*.php` \
        `find . -name \*.xml` \
        `find . -name \*.css` \
        `find . -name \*.less` \
        `find . -name \*.js -type f` \
        `find . -name \*.xsl` \
        `find . -name \*.dtd` \
        `find . -name \*.sh` \
        docs/README-DEV

# To check copyrights used:
# sed -n -e "s/.*\(Copyright (c).*\)/\1/p" `find . -type f`| sort | uniq | less