Fold new entries into changelog

changes/bug17109

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-  o Minor bugfixes:
-    - Fail during configure if we're trying to build against an OpenSSL
-      built without ECC support. Fixes bug 17109, bugfix on
-      0.2.7.1-alpha which started requiring ECC.

changes/feature16769

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-  o Minor features (ed25519):
-    - Add a --newpass option to allow changing or removing the
-      passphrase of an encrypted key with tor --keygen. Implements
-      part of ticket 16769.

changes/feature16944

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-  o Minor features (relay, ed25519):
-    - Add a new OfflineMasterKey option to tell Tor never to try
-      loading or generating a secret ed25519 identity key. You can use
-      this in combination with tor --keygen to manage offline and/or
-      encrypted ed25519 keys. Implements ticket 16944.

changes/geoip-september2015

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-  o Minor features:
-    - Update geoip and geoip6 to the September 3 2015 Maxmind GeoLite2 Country database.
-

changes/ipv6-exitpolicy-docs

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-  o Minor bug fixes (documentation, torrc exit policies):
-    - Advise users how to configure separate IPv4 and IPv6 exit
-      policies in the manpage and sample torrcs.
-    - Fixup formatting errors in the documentation changes from
-      tickets #16069 and #17027.
-      Related to fixes in ticket #16069 and #17027. Patch by "teor".
-      Patch on 2eb7eafc9d78 and a96c0affcb4c (25 Oct 2012),
-      released in 0.2.4.7-alpha.