Summary: Introduction and motivation

[mswl2012]

Introduction and motivation.

Three subchapters added:
1.1 - Introduction to economic aspects and FLOSS
1.2 - Market numbers around FLOSS
1.3 - A new paradigm in Internet

[sarroutbi]

This issue has been partly accomplished.
Code was submitted (commit 8807c77) to add information related to introduction and motivation from the first class.