Closes #5.  Changed code to: * set default repo to use https * Check to see if download.file.method option is NULL and set to libcurl or wininet.
Closes #5.  Changed code to:
* set default repo to use https
* Check to see if download.file.method option is NULL and set to libcurl or wininet.

The checking doesn't handle all versions of R and I'm waiting for R 3.2.2 to be released to test how it works before I spend lots of time adding checks.

dgabbe/r-config,dgabbe/rprofile.site,dgabbe/rprofile.site