Added bashrc extension to users-formula

This will ensure a given bashrc file in a users home dir.
Default it will search for a bashrc in salt://users/files/bashrc/{{ username }}/bashrc
If no file is found it will install the default from
salt://users/files/bashrc/bashrc

users/files/bashrc/bashrc

@@ -0,0 +1,9 @@
+#
+# ~/.bashrc
+#
+#
+# If not running interactively, don't do anything
+[[ $- != *i* ]] && return
+
+alias ls='ls --color=auto'
+PS1='[\u@\h \W]\$ '