Completed principle component extraction. Be careful with large sparse
datasets when using the demean feature.
w	new file:   code/kPrinComps.m
Delete matlab.mat
Removed save file from data.
Merge branch 'TZUO' of https://github.com/tzuohann/MASTER into TZUO
Completed stepwise regression for feature selection.
Finished principle components estimation.
ReInit
New Init
Merge branch 'tzuo'

Conflicts:
	code/spellcheck.py
New Init
Init
Merge branch 'master' of https://github.com/tzuohann/MASTER

Conflicts:
	code/spellcheck.py
added Tzou's file again.
Merge branch 'joao'

Conflicts:
	code/spellcheck.m
	code/spellcheck.py
added new training dataset.
properly merge.
Merge branch 'joao' of https://github.com/tzuohann/MASTER into joao