Merge branch 'feature_15055_v2'

changes/bug17779

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+  o Minor bugfixes (leak at exit):
+    - Fix a small harmless memory leak at exit of the previously unused
+      RSA->Ed identity cross-certificate. Fixes 17779; bugfix on
+      0.2.7.2-alpha.
+
+

changes/bug20027

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+  o Minor bugfixes (ed25519 certificates):
+    - Correctly interpret ed25519 certificates that would expire some
+      time after 19 Jan 2038. Fixes bug 20027; bugfix on 0.2.7.2-alpha.

changes/feature13752

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+  o Minor features (fingerprinting resistence, authentication):
+    - Extend the length of RSA keys used for TLS link authentication to
+      2048 bits. (These weren't used for forward secrecy; for forward
+      secrecy, we used P256.) Closes ticket 13752.

changes/feature15055

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+  o Major features (protocol, Ed25519):
+    - Tor relays now use Ed25519 to prove their Ed25519 identities and
+      Ed25519 to one another, and to clients. This algorithm is faster
+      and more secure than the RSA-based handshake we've been doing until
+      now. Implements the second big part of proposal 220; Closes ticket
+      15055.