Changes

Summary

1. First pass on the Manager system for Guilds Created an Empty RestAction (commit: 7cec78b) (details)

Commit 7cec78bb81d849f8535441d3b2537700f819819d by Austin Keener First pass on the Manager system for Guilds Created an Empty RestAction (commit: 7cec78b)
	src/main/java/net/dv8tion/jda/core/managers/GuildManagerUpdatable.java
	src/main/java/net/dv8tion/jda/core/entities/Guild.java (diff)
	src/main/java/net/dv8tion/jda/core/managers/GuildManager.java
	src/main/java/net/dv8tion/jda/core/requests/RestAction.java (diff)
	src/main/java/net/dv8tion/jda/core/exceptions/GuildUnavailableException.java
	src/main/java/net/dv8tion/jda/core/entities/impl/GuildImpl.java (diff)