.bash_prompt: Improve escape sequences

Closes #598. See https://github.com/mathiasbynens/dotfiles/pull/598#issuecomment-157090316.

.bash_prompt

@@ -53,7 +53,7 @@ prompt_git() {
 
 		[ -n "${s}" ] && s=" [${s}]";
 
-		echo -e "${1}${branchName}${blue}${s}";
+		echo -e "${1}${branchName}${2}${s}";
 	else
 		return;
 	fi;
@@ -111,7 +111,7 @@ PS1+="\[${white}\] at ";
 PS1+="\[${hostStyle}\]\h"; # host
 PS1+="\[${white}\] in ";
 PS1+="\[${green}\]\w"; # working directory
-PS1+="\$(prompt_git \"${white} on ${violet}\")"; # Git repository details
+PS1+="\$(prompt_git \"\[${white}\] on \[${violet}\]\" \"\[${blue}\]\")"; # Git repository details
 PS1+="\n";
 PS1+="\[${white}\]\$ \[${reset}\]"; # `$` (and reset color)
 export PS1;