.bash_prompt: Improve title

This will set the title of the current terminal tab to the name of the folder you are in rather than the whole path.

Closes mathiasbynens#623.

Author: stevemao

.bash_prompt

@@ -104,7 +104,7 @@ else
 fi;
 
 # Set the terminal title to the current working directory.
-PS1="\[\033]0;\w\007\]";
+PS1="\033]0; ${PWD##*/}\007";
 PS1+="\[${bold}\]\n"; # newline
 PS1+="\[${userStyle}\]\u"; # username
 PS1+="\[${white}\] at ";