Update unit.rst

Link to Gary's (free) Pycon talks in which he explains functional core / imperative shell...
Merge pull request #1 from hjwp/patch-1

Update unit.rst
new patching code
add randint
extra
adding outline
slides url
cleanup
report
cool
training file
full
space
add image and hiring slide
unit and more things
descr
new files
==
add dropbox
t