Updated screenshots in Introduction for JBDS 8.

Also updated the instructions in the Introduction for JBDS 8.
Corrected occurrences of the package name, removing 'jdf'.
Corrected instructions on adding ShrinkWrap resolvers from WFK
tools BOM.
Updated screenshots to fit 640px.

Also corrected documentation for using Forge in JBDS 8.
Corrected JBoss BOM versions used in the documentation.