Gdistance

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BUG FIXES
* export method `raster,TransitionLayer-method`

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BUG FIXES

* Fix R:devel errors in running the examples

NEW FEATURES

* gdistance builds with roxygen2
* new website and venue to report issues
* a recommended citation is added

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* cBind, rBind (deprecated in Matrix package) changed to cbind, rbind

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* Changes to reflect publication in JSS
* Bug fixed in AccCost (mode="out"), thanks to Henjo de Knegt

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* Changes to vignette based on JSS review

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* Final touches for submission to JSS