Add docs for new Data Files feature
Fix typo in data docs; update section pagination for migrations to correctly point back to data
Rebase on upstream/master; rename file to work with docs_ul includes file
another pass on the documentation of generators

This commit refines the docs contributed in f074bb6.
Add a cucumber feature for variable includes
implement variable retrieval in include tag

Fixes #1464.
Fix code to allow dots in variables
extend feature to ensure it works with parameters as well
Document variables in include tag
Include tag: provide path in case of render error
Output path in case of render error in included file

Fixes #1591.
Downgrade to Maruku 0.6.0 to fix all the tests
Merge pull request #1598 from mojombo/maruku-0.6.0

Downgrade to Maruku 0.6.0 to fix all the tests
Update history to reflect merge of #1598
Merge pull request #1596 from maul-esel/error-file

Output path in case of liquid error in include file
Update history to reflect merge of #1596
Add parenthesis to the call for super
Merge pull request #1503 from swanson/add-docs-for-data-feature

Add docs for new Data Files feature
Update history to reflect merge of #1503
Merge pull request #1592 from fxn/master

another pass on the documentation of generators