Corrected POD syntax errors. PR#3353
Add information to BUGS section of enc documentation. PR#3354
Fix grammar error in verify pod. PR#3355
Unit/regression test for TLS heartbeats.

Regression test against CVE-2014-0160 (Heartbleed).

More info: http://mike-bland.com/tags/heartbleed.html

(based on commit 35cb55988b75573105eefd00d27d0138eebe40b1)