Added get_executable_path() function.

Necessary to find correct executable paths for python and R targets and not have duplicate code.
Added r-package deploy code to Application class.
Removed custom R deploy code.
Renamed package-name and package-repo.

Now r-package-name and r-package-repo to be clearer.
Added app_sect argument to get_executable_path().
Fixed string formatting issue.
Fixed issue with using app var instead of self.
r-package deploys can now be performed in parallel
Merge pull request #23 from jrrideout/issue_3

Added new r-package build-type.
Partially implemented local-repository option.
Merge branch 'master' into issue_24

Conflicts:
	lib/application.py
Finished local-repository implementation.

Now onto testing these changes...
Fixed issue with copytree call.

Needed to append new dir name to end of destination dir.
Merge pull request #25 from jrrideout/issue_24

Added local-repository option.