Manually add jsdoc dependencies

Looks like there is a version mismatch with the taffydb and
underscore dependencies of jsdoc, so we add them here manually.
Merge pull request #2187 from ahocevar/fix-jsdoc

Manually add jsdoc dependencies
Add more tests for ol.structs.RBush#forEach
Better ol.structs.RBush#forEach documentation
Merge pull request #2186 from fredj/rbush-tests

Add more tests for ol.structs.RBush#forEach
Add ol.structs.RBush#__iterator__ function
Add ol.structs.RBush#getIteratorInExtent_ function
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