Added profile for de-de in pom.xml.
Created de-de book content (copy of en version).
Adapted docbook language setting to de.
Started translation of book.xml, bookinfo.xml, ch01.xml.
ch01.xml is work in progress...
Typo
Chapter 1 translated.
Translation chapter 2.
Minor corrections in chapter 1.
Focus on translation of chapter 3. Minor changes and correction elsewhere.
Translation of first part in chapter 4. Minor corrections in chapter 2.
More translation of chapter 4.
Translation chapter 4 into German. Typo in English version.
starting translation of chapter 5.
Chapter 5 translated into German. Minor fix in English version and German translation of chapter 1.
Started translating chapter 6.
Finished translation chapter 06.
Translation into German: chapters 7 to 9 plus bibliography.
Merge pull request #5 from OMerkel/master

Translation of tutorial into German. Minor correction elsewhere.