added additional properties to getPeerCertificate with test case

[niclashoyer]

Added additional properties to getPeerCertificate, now includes
subjectAltName, Exponent and Modulus (FOAF+SSL friendly).

Patch written by Nathan,
http://groups.google.com/group/nodejs/browse_thread/thread/1d42da4cb2e51536

I also added a test case based on test-https-simple to test the new attributes.

[koichik]

@niclashoyer - Thanks! This time, can you sign the CLA? :)
And can I modify the patch?

1. Apply @pquerna's suggestion.
2. Fix BIOs usage.

[niclashoyer]

just signed it.

Of course, please modify the patch :)

[bnoordhuis]

Use NID_subject_alt_name: da3bc23

However, valgrind is complaining wildly on the test/simple/test-https-foafssl.js test (with and without da3bc23). Needs further investigating.

[koichik]

Fix BIO's usage: 937dc27

[koichik]

@bnoordhuis - With 937dc27, valgrind isn't complaining.

before:

==8852== ERROR SUMMARY: 4 errors from 4 contexts (suppressed: 4 from 4)

after:

==8931== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)

Can I merge all together?

[bnoordhuis]

@koichik: yes, go ahead.

[koichik]

@niclashoyer - Thanks for your contribution!