added install-nbextension and trust completions

examples/IPython Kernel/ipython-completion.bash

@@ -24,7 +24,7 b' _ipython()'
 {
     local cur=${COMP_WORDS[COMP_CWORD]}
     local prev=${COMP_WORDS[COMP_CWORD - 1]}
-    local subcommands="notebook qtconsole console kernel profile locate history nbconvert kernelspec "
+    local subcommands="notebook qtconsole console kernel profile locate history nbconvert kernelspec install-nbextension trust "
     local opts="help"
     if [ -z "$__ipython_complete_baseopts" ]; then
         _ipython_get_flags baseopts
@@ -50,7 +50,7 b' _ipython()'
                 _ipython_get_flags $mode
                 opts=$"${opts} ${baseopts}"
                 ;;
-            "locate" | "profile")
+            "locate" | "profile" | "install-nbextension" | "trust")
                 _ipython_get_flags $mode
                 ;;
             "history" | "kernelspec")