Update submodules for 1.04
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Produce dirhtml by default
Fix datastore API documentation
Fix codelist descriptions
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Add missing requirement
Minor update to tell us where the generated files are
Add extra level above schema elements
Link categories to category codelist, fixes #3
[#8] Add script for adding 'last updated on' date
[#17] Fix codelist API links
[#18] Link back to attributes from code list
Combine pages in python instead of in bash

Allows us to put extra documentation in the middle of the page, fixes #19
Add function for creating github source links

fixes #22 and #17
[#11] Begin adding schema table
[#11] Continue adding schema table
[#11] Add occur column to scheam table
[#11] Add text() rows to schema table
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