Update copyright year to 2014
Update NEWS.md with 7.1 feature and bugfix list
api/http: Fix compiler warning (closes #266)
NEWS: Remove a lot of cruft from 7.1 release notes
NEWS: Fix sasl section of 7.1 release notes
NEWS: Fix typo
Bump master to 7.2.0-dev
Add CLEAR ajoin help
Merge pull request #270 from Iota-Spencer/patch-1

Add CLEAR to ajoin help
saslserv/main: destroy session when login_user() fails

Since authentication is over, the mechptr must be unset; otherwise, if
the client gets rejected due to login_user() failure and wants to try
again, it will receive a bogus failure:

    [first attempt]
    -> :3CH ENCAP * SASL 3CHAAAABU * S PLAIN
    <- :01A ENCAP chary.rain SASL 01AAAAAAF 3CHAAAABU C +
    -> :3CH ENCAP * SASL 3CHAAAABU * S AHRlc3RlcgB1dHZ1amViZmJwZHQ=
    saslserv :3CHAAAABU failed LOGIN to tester (frozen)
    <- :01A ENCAP chary.rain SASL 01AAAAAAF 3CHAAAABU D F
    [second attempt]
    -> :3CH ENCAP * SASL 3CHAAAABU * S PLAIN
    <- :01A ENCAP chary.rain SASL 01AAAAAAF 3CHAAAABU D F
    [third attempt]
    -> :3CH ENCAP * SASL 3CHAAAABU * S PLAIN
    <- :01A ENCAP chary.rain SASL 01AAAAAAF 3CHAAAABU C +

This change also matches the existing behavior of destroying SASL
session after any other auth failure.