Fix left quotes
added neural nets notes
first pass at clustering notes
Added more extensions.
Merge branch 'master' of https://github.com/achalddave/EECScheats

Conflicts:
	189cheatSheet.tex
Merge branch 'master' of https://github.com/kvsikand/EECScheats

Took the clustering section only.
NN almost done
Merge branch 'master' of https://github.com/sharma409/EECScheatsheets
pushing unfinished NN section for update by Eddie
fit NN on one column. submitting for peer review
taking NN out since they were allready done, formatting K means