backfills release notes for 1.2.6 and 1.2.7 and adds framework for 1.2.8 release notes
adds target _blank so collaborator links from the collaborator page open in a new tab (#173)
changes accordion class in the scope of people.php to make accorion more friendly to the eventual people page remodel.
fixes small overlap issue with former employees drop down 'button' and its contents. (#172)
Merge branch '1.2.9' into 1.2.8