Fixes the email address to use datacarpentry.org.
Added contributors' names to the lesson files
fixes in 07-plotting-with-matplotlib, added plots and links
Added image and updated exporting data
Fixed wording in exporting data
Intriduction - added dicts and functions
Merge pull request #27 from czterybity/fixes_in_matplotlib

fixes in 07-plotting-with-matplotlib, added plots and links
Merge pull request #28 from czterybity/python_basics

Introduction - added dicts and functions
Merge pull request #23 from datacarpentry/fix-email

Fixes the email address to use datacarpentry.org.
Merge pull request #31 from apawlik/lesson-on-formats

A stub for lesson on formats - csv / tsv and so on.
Merge pull request #26 from apawlik/excel-lessons

Added contributors' names to the lesson files
Further development of CSV problems lesson