Fix #419: bnd generates xml 1.1 documents, should stick to 1.0

Also change the quotes to those that are normally used.

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Merge pull request #421 from bndtools/issue419

Fix #419: bnd generates xml 1.1 documents, should stick to 1.0
#416 support custom bnddir name