[#226] Implemented generic text highlighter for JSON, XML and plain text. Deleted jsonpreview.
unified indentation
[#226] Rename text highligher extension to text preview
[#226] Add missing license for highlight.js
[#226] Use github style
[#226] Make jsonp preview more resistant, add missing converter to jsonp
[#226] Rename text preview tests, add test for whether css is present
[#226] Make it easier to add new formats to the json/xml/text preview
Merge remote-tracking branch 'okfn/master' into 226-text-highlighting

Conflicts:
	ckanext/textpreview/tests/test_preview.py
Merge branch 'master' into 226-text-highlighting

Conflicts:
	ckan/config/deployment.ini_tmpl
[#226] Fix merge
[#226] Preview geojson with json preview
[#226] Make ajax request for preview async to prevent the request from blocking the ui
[#226] Show original error message, if possible, instead of a not very helpful default message.
Merge branch 'master' into 226-text-highlighting
[#226] PEP8 and load jpeg direktly as well
[#226] Make the formats configurable
Merge branch 'master' into 226-text-highlighting
[#226] Update data viewer docs
[#226] Fix PEP8