Copyright header update, s/2013/2014

[gubatron]

No description provided.

[laanwj]

Please only update the copyright if the file has actually been changed in
2014. Did you check this?

[BitcoinPullTester]

Automatic sanity-testing: PASSED, see http://jenkins.bluematt.me/pull-tester/311a0f01a0759268e353920b075d5d89e4e3a5e8 for binaries and test log.
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Contact BlueMatt on freenode if something looks broken.

[gubatron]

nope, just learned something today about source code copyight headers. Will re-submit in a bit.