Update build to use scala 2.10.2 and add scalatest dependecy
Added solutions and tests for the Getting Started chapter
Updated sbt-idea plugin dependency
Updated to the new Chapter 2: Getting Started
Updated to the new Chapter 3: Functional Data Structures
Adapted solutions to the new numeration of exercices in Chapter 3
Updated solutions to Chapter 4: Error Handling without Exceptions
New solution to sequence using for
Better names for variables