address issue #350 by renaming Modules

[eddelbuettel]

affects four different unit tests
also very minor cleanups

[eddelbuettel]

Interesting. So it fails at Travis while it passes here at on my box. I'll separate out more modules then -- now that World is taken care of this crashed over Num.

[eddelbuettel]

@kevinushey @jjallaire Let me know what you think -- this ought to be ready to merge.

That said -- I am running a rev.dep now which I started before I noticed the need for the second commit. Current status is 270 out 449 good, 15 bad, rest pending -- which looks in-line with the last full check in July. So we may as well wait the few more hours until this completes.

[kevinushey]

Looks good to me.

[eddelbuettel]

Rev.deps finished fine, logs and summary committed in RcppCore/rcpp-logs@ebbce0c

No new issues that were caused by Modules; there is one package which fails it tests for an odd reason I couldn;t immediately attribute.