Changing user data read endpoint from /v1/profile to /v1/session/read

As described in an email today, I changed the profile endpoint route from /v1/profile to /v1/session/read along with a different scope string replacing 'profile' to 'session'.

Note: Its now possible to retrieve user details based on a sessionToken on accounts.webplatform.org. For implementation proposal, see: [SSO and remembering, Proposal 2](http://docs.webplatform.org/wiki/WPD:Projects/SSO/How_we_implemented_it#SSO_and_remembering.2C_proposal_2)