Added an extra parameter for a server certficate file.
It allows to use an https://...:8332 url with a self signed certificate.
Useful for running your own server over the net.
And keeping anyone from stealing your money when they sniff the traffic.
Made an extra entry point called: NewBitcoindClientSSL
It takes the extra tls server certificate as parameter.
It leaves the original NewBitcoindClient untouched.
Merge pull request #7 from gwitmond/master

Added TLS-certificate to allow for encrypted connections between client and bitcoin server