Velocity support added, plugin splitted

WARNING! Please notice that plugins that used VK-API 0.2.3 or older, will not be working! Tell it to the developers

Updates:

• Velocity support added
• From 0.3.0 version plugin will be spliitted into spigot,bungee,velocity
• Bukkit events moved to the com.ubivashka.vk.bukkit.events folder, if you are developer, please move your old events