Support /oauth2/token_from_oauth1 (OAuth 1 token upgrade) and /disable_access_token.
Minor fixes for PHPStorm and ApiGen warnings.
examples/authorize: Not everyone has readline(); use fgets() instead.
Doc updates: Point to endpoint docs on Dropbox website.
Expose the lower-level methods used to make API requests.

This makes it easier for people to make a custom API request, in case
the SDK doesn't expose some piece of functionality.
Stricter SSL settings: Fix trusted certs, ciphersuites, misc options.

Sadly, even with the all the correct options set, some PHP installations
just don't do SSL properly.  You can run the included test program to
see if your PHP installation performs some basic SSL checks.

Thanks to Anton Mityagin for figuring all this out.
ChangeLog: Update for 1.1.2 release.
Fix comment in Curl.php to point to correct test-ssl.php example.

Also polish up some other comments in the file.
For unexpected HTTP response codes, include the value in the exception.

Exception_BadResponseCode has a field to store the HTTP status code
and was written specifically for this situation.  Not sure why we
were using Exception_BadResponse.

This lets callers get the exact HTTP response code, in case the SDK
doesn't properly handle all the response codes from Dropbox.
Don't set ciphersuites if SSL backend is NSS.

For various reasons, it's very difficult to reliably set SSL
ciphersuites on when the cURL backend is NSS.
Make SSL tester print out OS, PHP, and cURL version info.
Minor space/newline fixes.
Minor doc fixes.
ChangeLog: Update for 1.1.3 release.