Update to Spoofax Nightly - s41087
Merge commit 'fb1896c56f4a341f22b5cbd0d91952b31eab3b3f' into labs
Merge commit 'e3110da9462ba0167bf5f8627d8031036d5413b7' into labs
Added maven pom.xml files.
more meaningful default message for duplicate definitions
Update primitives
Add make-set task factory that accepts extra dependencies.
Adapt to changes in index interface.
Fix index globals
Fix analysis debugging
Storing properties have set semantics
Pass source argument to index-stop-collection.
Fix wrong argument order.
Distinguish between index primitives that return values and those that return key-value pairs.
Adapt analysis language to changes in index input.
Merge branch 'index-ds-refactor'

Conflicts:
	org.spoofax.meta.runtime.libraries/task/tasks.str
Merge pull request #13 from dcharkes/set-based-properties

Store properties from NaBL with set semantics.
Merge pull request #12 from Virtlink/master

HTML escaped property values in hover tooltip.
Merge pull request #11 from dcharkes/master

More meaningful default message for duplicate definitions.
Added missing import