New plugin: Explain Shell

plugins/explainshell/explainshell.plugin.zsh

@@ -0,0 +1,17 @@
+function explain {
+  # base url with first command already injected
+  # $ explain tar
+  #   => http://explainshel.com/explain/tar?args=
+  url="http://explainshell.com/explain/$1?args="
+
+  # removes $1 (tar) from arguments ($@)
+  shift;
+
+  # iterates over remaining args and adds builds the rest of the url
+  for i in "$@"; do
+    url=$url"$i""+"
+  done
+
+  # opens url in browser
+  open $url
+}