ROADMAP: extend the HTTP/2 stuff, remove SPDY

New stuff - libcurl

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1. http2 test suite

1. HTTP/2

2. http2 multiplexing/pipelining

 - test suite

 - http2 multiplexing/pipelining

 - provide option for HTTP/2 "prior knowledge" over clear text

 - provide option to allow curl to default to HTTP/2 only when using HTTPS

3. SPDY

2. SRV records

4. SRV records

3. HTTPS to proxy

5. HTTPS to proxy

6. make sure there's an easy handle passed in to `curl_formadd()`,

4. make sure there's an easy handle passed in to `curl_formadd()`,

   `curl_formget()` and `curl_formfree()` by adding replacement functions and

   deprecating the old ones to allow custom mallocs and more

7. add support for third-party SASL libraries such as Cyrus SASL - may need to

5. add support for third-party SASL libraries such as Cyrus SASL - may need to

   move existing native and SSPI based authentication into vsasl folder after

   reworking HTTP and SASL code

8. SASL authentication in LDAP

6. SASL authentication in LDAP

9. Simplify the SMTP email interface so that programmers don't have to

7. Simplify the SMTP email interface so that programmers don't have to

   construct the body of an email that contains all the headers, alternative

   content, images and attachments - maintain raw interface so that

   programmers that want to do this can

10. Allow the email protocols to return the capabilities before

8. Allow the email protocols to return the capabilities before

    authenticating. This will allow an application to decide on the best

    authentication mechanism

11. Allow Windows threading model to be replaced by Win32 pthreads port

9. Allow Windows threading model to be replaced by Win32 pthreads port

12. Implement a dynamic buffer size to allow SFTP to use much larger buffers

10. Implement a dynamic buffer size to allow SFTP to use much larger buffers

    and possibly allow the size to be customizable by applications. Use less

    memory when handles are not in use?