Merge pull request #206 from svirpridon/master

Fixed unregisterInternal NullPointerException
Fix issue #200 - Correct inaccurate javadocs for setTCPKeepAliveInterval and setTCPKeepAliveIdle
Merge pull request #208 from trevorbernard/master

Fix issue #200 - setTCPKeepAliveInterval and setTCPKeepAliveIdle have incorrect javadoc
Update pom.xml

Correct license name
Merge pull request #209 from trevorbernard/master

Correct POM license name
Update Debian and Redhat package files
Merge pull request #210 from trevorbernard/master

Update Debian and Redhat package files
Revert "Fix issue #197 - Only sign artifacts when it's time to release"

This reverts commit 0a7131d32cad76653cef3c52ec47de7155cb8ffe.
[maven-release-plugin] prepare release v2.1.3
[maven-release-plugin] prepare for next development iteration
Merge pull request #212 from svirpridon/master

Add toString() method to ZMsg to aid debugging
Remove unused import
Merge pull request #213 from trevorbernard/master

Remove unused import
Some fixes to README, plus note about JeroMQ
Merge pull request #214 from hintjens/master

README fixes
Test for issue #216
Merge pull request #217 from trevorbernard/master

Test for issue #216
Fixed NPE in Poller and bad null logic in JNI.