Updating content for Unit 2 (Beginner QGIS and InaSAFE)

Changing screenshots and some edits for QGIS 2.0 and InaSAFE 2.0
Adding images for Unit 2 (id) and fixing some images
Merge pull request #99 from emirhartato/develop

Trying to update contents into QGIS 2.0 and InaSAFE 2.0