grails: hibernate & tomcat versions; upgrade

grails upgrade 2.3.7 after https://github.com/DICE-UNC/idrop/issues/2
Typos in user-interface text not yet i18nalized
Merge pull request #11 from ajm475du/master

Upgrade to grails 2.3.7 and fix a couple typos
4 merge with master
#14 prep for creating and announcing downloads