Added explainshell module

modules/explainshell/README.md

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+#Explainshell
+
+Adds a keybinding to open (explainshell.com)[http://www.explainshell.com] with the content of the command line.
+
+##Settings
+
+###Key-Binding
+The keybinding to open (explainshell.com)[http://www.explainshell.com]
+
+`zstyle ':prezto:module:explainshell' key-binding '^K'`

modules/explainshell/init.zsh

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+#
+# Adds a explain function and explainshell widget
+# 
+# Authors
+#   C Lentfort
+#
+
+
+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
+  $BROWSER -t $url &> /dev/null
+}
+
+function explainshell {
+    explain $BUFFER
+}
+
+zle -N explainshell
+
+zstyle -s ':prezto:module:explainshell' key-binding 'key_binding'
+if [[ -n "$key_binding" ]]; then
+  bindkey "$key_binding" explainshell
+fi
+
+unset key_binding