137 role command cannot read properties of undefined (#141)

* Fix issue with bot crashing

* Fix server prefix not showing

* Add easy way to configure role command

* Move help text to its own directory

* Make role config command to use role id

data/usage/config.txt

@@ -5,7 +5,7 @@ bot.prefix: The bot prefix for the server (Default: "v!")
 
 commands.disabled: Disabled commands, separated by commas (Default: "")
 
-role.assignable: List of roles assignable to user (Default: [])
+role.assignable: List of roles assignable to user, separated by commas (Default: "")
 role.moderator: The moderator role name (Default: "Moderator")
 role.administrator: The administrator role name (Default: "Administrator")
 role.muted: The muted role name (Default: "Muted")

data/usage/role.txt

@@ -0,0 +1,8 @@
+USAGE: config <add|remove> <Role ID> 
+
+===[ EXAMPLE ]===
+To add a role:
+- config add 000000000000000000
+
+To remove a role:
+- config remove 000000000000000000