Adds the ability to create a PBKDF2 hash with SHA-512 digest

[stwiname]

No description provided.

[dlongley]

@stwiname,

The SHA-512 module adds itself to forge.md, so that way you can leave it out of your project if you don't want to use it (see:

forge/js/sha512.js

Lines 17 to 22 in 2115c6d

	var sha512 = forge.sha512 = forge.sha512 || {};
	forge.md = forge.md || {};
	forge.md.algorithms = forge.md.algorithms || {};
	// SHA-512
	forge.md.sha512 = forge.md.algorithms.sha512 = sha512;

). So I don't think we need that first change.

However, the additional tests are always welcome.

[stwiname]

Is there something i need to do to initialize sha-512 then?

If I remove the changes to md.js then the added tests fail.

[davidlehn]

sha512 support isn't added by default to the md module so that test will have to load it. Look at the code at the bottom of the file and update it to load sha512.

[dlongley]

Addressed by #456.