Removed cumulative option for torque cat. wizard

Bonus: fixed typos in comments on changed lines
fixes #903
Updated NEWS and README

Add what changed in this branch, and me as contributor
Merge branch 'master' into 903-remove-cumulative-for-torque-cat

Conflicts:
	README.md
Merge pull request #1137 from CartoDB/903-remove-cumulative-for-torque-cat

903 remove cumulative for torque cat