Remove grok usage in converters, use ZCML.
Remove grok usage in indexer, use ZCML.
Remove grok / martian usage in directive, use ZCML.
Remove grok usage in behaviors tests, not required anymore.
Load ZCML dependencies explictly.
Remove grok.
Update setup.py.
Update dependencies.
Change integer tests so that it Works on Plone 4.3 as well as older ones.

Since Plone 4.3 the integer values are converted to unicode in the index.
See: https://github.com/plone/Products.CMFPlone/blob/master/Products/CMFPlone/UnicodeSplitter/splitter.py