Add bootstrap option for condor.local service

[djw8605]

The condor.local service should be able to use the R-bootstrap.py functionality the same that the bosco.local service uses.

Proposed Solution

A argument to grid.init should be added to indicate to use the bootstrap script when submitting the job. For example:

grid.init(service="condor.local", localTmpDir="tmp", bootstrap=TRUE)

bootstrap will be implicitly true when service="bosco.local". The bootstrap will download and install R from the ceneralized BoscoR repos, then run the user function inside the downloaded R. This will be useful is submitting to resources without a centeralized R installation.

Attributes such as Rurl and remotePackages are available in the grid.init function, and act the same as they do in the bosco.direct service. See wiki page for details about these attributes.

[djw8605]

Committed, and put into develop.