fix spell mistake
solve excercise 1.6
problem of Alyssa, where she is trying to use her own 'new-if' procedure
instead of special form 'if'
add few notes for cron
Merge branch 'master' of github.com:vishaltelangre/notes

* 'master' of github.com:vishaltelangre/notes:
  prettify markdown of notes on advanced git by peepcode