SEC-2119: Add a 'form-parameter' attribute to <remember-me>

[obecker]

This change extends the namespace configuration of
with a 'form-parameter' attribute. The introduced attribute sets
the 'parameter' property of AbstractRememberMeServices.

This enables overriding the default value of
'_spring_security_remember_me' using the namespace configuration.

Additional changes:

• Map the default schema location spring-security.xsd to the
  3.2 version (spring-security-3.2.xsd)

Issue: SEC-2119

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[rwinch]

Thank you for the pull request! I have added this to master with a few modifications.

• Updated so the build would pass (some files still referenced 3.1 instead of 3.2)
• Changed the form-parameter to rememberme-parameter to make more explicit
• Updated the commit comment to match Spring Security's contributing guidelines (i.e. prefix commit comment with the JIRA ID)
• use the rnc file instead of directly editing the xsd file

Thanks again for the contribution!

[obecker]

Alright, then the XML configuration would look like

<remember-me rememberme-parameter="foobar" ... />

I'm OK with making the attribute name more explicit, however, I believe a additional hyphen would make it even more consistent, thus I would suggest remember-me-parameter instead of rememberme-parameter.

[rwinch]

Good feedback...I had debated this myself. If you have a chance, please send a pull request for these changes.

NOTE: Please be sure to run the build to ensure all tests pass before submitting (i.e. the doc will need updated)

[obecker]

Done.
See #31