Some tutorial tweaks.#1

Merged

nouiz merged 3 commits intolisa-lab:masterfrom

yosinski:master

Feb 14, 2012

Commits on Nov 11, 2011

minor spelling
yosinski
committed

Commits on Feb 9, 2012

Merge remote branch 'upstream/master'
yosinski
committed

Commits on Feb 14, 2012

spelling, grammar, formatting fixes
yosinski
committed