remove mention of for loop

Couldn't see a mention of for loops, perhaps it was in an earlier version, or yet to appear?
Update 01-starting-with-data.Rmd
Update 01-starting-with-data.Rmd
Merge pull request #8 from apawlik/excel-lessons

Splited Excel tutorial into separate lesson-files and added img directory
Create README.md
short introduction to Python - initial file
First revision of first part of first lesson. Next revison will come tommorow, hopefully
Merge pull request #10 from apawlik/excel-lessons

Linked files between themselves
Merge pull request #2 from benmarwick/minor-edit---no

remove mention of for loop
Merge pull request #11 from czterybity/python_materials_leszek_sprint

short introduction to Python - initial file
Merge pull request #12 from klemensnoga/datacarpentry-python-klemens

First revision of first part of first lesson. Next revison will come tom...
Merge pull request #9 from alexduryee/master

Create planning placeholder
Update 00-intro.md

Alters language to de-emphasize CSV
Update 01-format-data.md

Fix spelling mistakes
Update 02-common-mistakes.md

Adds section on special characters
Update 03-dates-as-data.md

Adds notes on historical dates
Update 04-quality-control.md

Adds point about numerical vs text sorting
Update 05-exporting-data.md

Adds note on cross-platform compatibility
Scripting lesson from NESCent's May 8-9, 2014 workshop.

The lesson started from SWC material on shell scripting, but subsequently
underwent a large-scale rewrite and partial reorganization and narrowing
to strictly focus on shell scripting for building executable data pipelines.
Full history is at NESCent/2014-05-08-datacarpentry@@a372d81 and preceding
commits from me.
Copying gitignore file from NESCent May 2014 workshop.

You don't want R's output files accidentally in your repo. This is essentially
a copy as of NESCent/2014-05-08-datacarpentry@b37cbc0bc99c79735046178c38f53d51b6730438.