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
Update history to reflect merge of #1592

Combine it with the entry for #1590 since they're related. Move it
down to the site enhancements section since both pulls are changes to
the site.
Move catching of liquid errors in include tags

The previous code only caught render-time errors. This change
makes it catch parse-time errors as well, such as unknown tags.
output correct path in case of liquid error in layout

As with includes, an error in a layout was reported on the
page that used the layout. Fix this by passing on the path
of the layout that is rendered.
Update rake dependency to ~> 10.1
Update rr dependency to version ~> 1.1
Update coveralls dependency to ~> 0.7.0
Update cucumber dependency to ~> 1.3
Update launchy dependency to ~> 2.3
Update kramdown dependency to ~> 1.2
Merge pull request #1601 from maul-esel/fix-error-file

Fix error file reporting
Update history to reflect merge of #1601
Merge pull request #1495 from maul-esel/variable-include

Variable {% include %}