introduction added
added chapter to main file
added planning chapter
Merge pull request #17 from magnusjerre/introduction

Introduction
wrote introduction/planning
Merge pull request #18 from magnusjerre/introduction

wrote introduction/planning
chapter 6 added
Merge pull request #19 from magnusjerre/reqspec3

chapter 6 added
fixed bugs
Merge pull request #20 from magnusjerre/introduction

fixed bugs
Merge branch 'master' of https://github.com/magnusjerre/customer_driven_project into life_cycle
Revision due to proof reading