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Fixes #210

Completely changed the way entity spans are created/tracked.
Added error messages for document loading
Added Orlando and CWRC Entry mappings
Related to #210
Fixed entity/struct priorities

Prioritizes entity when tag has struct and entity entries.
Empty entityHighlight is removed correctly
Certainty buttons populate markup options

Also fixed duplicate attributes in exported XML
Merge commit '64b0c7828a45b5f6fe7d16386ed691bf60c3cf33' into islandora_markup_editor
Updated CWRC-Dialogs, added cookie login
Use cwrcRootUrl, rather than hardcoded path.
Changed js tree to be un-responsive until the css actually works with lower resolutions.
Allow baseUrl for require.js to be configured dynamically

By not specifying a default and instead using the default behaviour
(when using data-main, as the entry point) as noted here:

http://requirejs.org/docs/api.html#config-baseUrl

Projects that extend the CWRC-Writer will be able to provide their own baseUrl
config.
Fix for RDF XML namespace attributes generated when saving.

This is due to using the namespace prefix in the default namespaces and
then adding them again when building the RDF string.
Merge pull request #228 from nigelgbanks/issue-228

CSS default styles strange behavior when editor is smaller than 768px wide.
Merge pull request #229 from nigelgbanks/issue-229

Can't configure baseUrl for require.js
Merge pull request #230 from nigelgbanks/issue-230

CWRC-Writer makes RDF xml invalid upon saving
Fixes #227
Dialogs initialization change