added bash autocompletion script for sshch aliases

sshch_bash_completion.sh

@@ -0,0 +1,11 @@
+_sshch_complete()
+{
+        local cur_word alias_list
+        cur_word="${COMP_WORDS[COMP_CWORD]}"
+        alias_list=`sshch -l | sed 's/,//g'`
+        COMPREPLY=($(compgen -W "$alias_list" -- $cur_word))
+        return 0
+}
+
+complete -F _sshch_complete sshch
+