Adding mankier.com explain() function to explain other commands

plugins/available/explain.plugin.bash

@@ -0,0 +1,23 @@
+cite about-plugin
+about-plugin 'mankier.com explain function to explain other commands'
+
+# Add this to ~/.bash_profile or ~/.bashrc
+explain () {
+  if [ "$#" -eq 0 ]; then
+    while read  -p "Command: " cmd; do
+      curl -Gs "https://www.mankier.com/api/explain/?cols="$(tput cols) --data-urlencode "q=$cmd"
+    done
+    echo "Bye!"
+  elif [ "$#" -eq 1 ]; then
+    curl -Gs "https://www.mankier.com/api/explain/?cols="$(tput cols) --data-urlencode "q=$1"
+  else
+    echo "Usage"
+    echo "explain                  interactive mode."
+    echo "explain 'cmd -o | ...'   one quoted command to explain it."
+  fi
+}
+
+# Update 26-03-2015. If using this command gives no output, see if running a simple fetch causes this error:
+# $ curl https://www.mankier.com
+# curl: (35) Cannot communicate securely with peer: no common encryption algorithm(s).
+# If so, try specifying a cipher in the curl commands: curl --ciphers ecdhe_ecdsa_aes_128_sha