Interest: As in the Data class, keep a _defaultWireEncoding and check it in wireEncode and save it in wireDecode.
encoding: In Tlv0_1WireFormat. decodeInterest, return the signed portion offsets as described in the doc comment.
security: In SelfVerifyPolicyManager, make _verifySha256WithRsaSignature take the signature and signedBlob directly so that it will work for interest as well as data.
security: In SelfVerifyPolicyManager, added more generalized _verify method and use it in checkVerificationPolicy.
encoding: Added WireFormat. decodeSignatureInfoAndValue.
security: In PolicyManager make skipVerifyAndTrust, requireVerify and checkVerificationPolicy take an Interest as well as Data.
security: In SelfVerifyPolicyManager make checkVerificationPolicy also take an Interest and use wireFormat.decodeSignatureInfoAndValue to parse the command interest.
security: In KeyChain, added verifyInterest.
tests: Make test_encode_decode_interest sign and verify the freshInterest to test signed interest.
CHANGELOG: Added verifyInterest.
Merge branch 'master' of https://github.com/named-data/PyNDN2 into DEREncoder
Public key setter was missing from Certificate
Typo fixes