Fail gracefully if another AtomSpace publisher module is already using that port
Simplify AtomCollection API
Merge pull request #439 from cosmoharrigan/apiupdate

Simplify AtomCollection in REST API
Provide a new, handy-dandy execution link
Provide a cmake file for the new execution link
compile execution link; also, misc cleanup.
Actually use the executionLink
Provide documentation
Merge pull request #440 from linas/master

Provide a new, handy-dandy ExecutionLink
minor cleanup (oops, forgotten previous commit)
Merge pull request #441 from linas/master

minor cleanup (oops, forgotten previous commit)