Merge pull request #4 from UCL/develop

Copy existing version control talk to here, ahead of work on Engineering...
Merge branch 'master' of github.com:UCL/rsd-talks
Updates from PDG
First version of Compressed Carpentry talk
Change from CR
Merge pull request #6 from UCL/develop

Develop
Merge pull request #7 from UCL/master

Staging->Master