Developer credits

Git commits in Moodle 3.5.0 by Guillermo Alvarez

commit 8669d43a9617e472f12243d4d5592b703b323005
Author: Guillermo Alvarez <guillermo.alvarez@blackboard.com>
Date:   Sat, 17 Mar 2018 00:40:40 +0800
Tag:    v3.5.0-beta

MDL-61673 calendar: Replace wrong string on mustache template

commit f1dd1cb5e066215b426b1be9df3a02406c56a837
Author: Guillermo Alvarez <guillermo.alvarez@blackboard.com>
Date:   Tue, 06 Mar 2018 03:28:46 +0800
Tag:    v3.5.0-beta

MDL-61129 survey: Add colgroup attribute at survey question tables