Fix: get_contenttype works when empty string is given as contentType. Empty string is default for contentType in NamedFile, not None
Validate image field : check if content is actually an image using mimetype.
more simple code
Backward compatibility of NamedFile with zope.app.file FileChunk.
  Avoids NamedFile validation unexpected failures.
ignore eclipse files
Merge branch 'master' of github.com:tdesvenain/plone.namedfile

Conflicts:
	.gitignore
	docs/HISTORY.txt
Merge pull request #8 from tdesvenain/master

Validate image field