Nightly commit, small lecture changes
slightly revised lecture 01_05 for new recording
Revised residual variation
Worked on the residuals lecture
Worked on the inference regression slides
Fixed 02_02 pdf
Updates
Revert "Updates"

This reverts commit e309b80f788266474247c105d13be3eff4d02ae2.
Minor changes to 02_01
Added a small change to 02_01
Merge remote-tracking branch 'upstream/master'