app_dirs -> app_dir in README.md

* not sure if the function was ever called app_dirs but it is not presently
Add Rstudio project
re-roxygenise with roxygen2 v4.0.1
Add LICENSE file

Needed by R CMD check (R-3.1.0).
Add package docs

* provides basic info about the package and ensures that ?rappdirs works.
import rather than depend on methods

* imports rather than depends should be sufficient
* explicit import in NAMESPACE needed to make R 3.1.0 R CMD CHECK happy
Add Gabor Csardi and myself as contributors
final new line for win-path.c

* squashes a clang warning
Switch tests to tests/testthat

* this is the new recommended location, allowing tests to be installed or not
* see https://github.com/hadley/testthat#integration-with-r-cmd-check
Merge remote-tracking branch 'jefferis/feature/testlocation' into setup

Conflicts:
	.gitignore
	rappdirs.Rproj