SSL Error

After running:

``` library(devtools)
install_github( 'ROAuth', 'duncantl' )

install_github( 'rDrop' , 'karthikram' )

library( rDrop )

dropbox_credentials<-dropbox_auth( mykey, mysecret )
```

The following error is returned:

"Error in function (type,msg,asError=TRUE) :

SSL certificate problem, Verify that the CA cert is OK. Details:
error: 14090086:SSL routine: SSL3_GET_SERVER_CERTIFICATE:certificate verify failed"

This is on a Windows 7 machine running R 2.15.1

Could the error be because the app being authorized only has access to one folder in the Dropbox, and not the full Dropbox?

Start by reproducing the install_github and dropbox_auth sequence on the reported Windows 7 and R 2.15.1 environment, using the SSL certificate error as the first checkpoint. Check whether Dropbox app folder permissions affect authentication separately from CA verification; done means identifying the cause and documenting a confirmed resolution or reproducible limitation.

Written by the indexing model from the issue text.