Replace mkdir with mkpath to address #58
add double quotes as per doco #58
Merge pull request #59 from techman83/mkpath

Fix issue reported in #58
Added 'exobrain version' command.
Make todo-tags case insensitive.
Add 'cached' keyword to Exobrain::Agent
Added basic exercise measurement classes.
Added Dockerfile.
Added Docker support in README.
Moar dockerfile
Documentation for exercise packets.
Merge remote-tracking branch 'upstream/master'