Make network related tasks asynchronously

Make network related tasks async, to ensure they won't cause spike lags.
Muted stack trace when checking for updates fails

Prevented huge stack traces from appearing when failed to check for
updates.
Updated Bukkit API to 1.7.2-R0.3

Updated Bukkit API to 1.7.2-R0.3
Updated Corruption API to 2.3.3

Updated Corruption API to the latest version 2.3.3
Updated MobArena API to 0.96.2

Updated the MobArena API to the latest version 0.96.2
Updated Essentials Group Manager API to 2.12.1

Updated the Essentials Group Manager API to the latest version 2.12.1
Updated PermissionsEx API to 1.20.4

Updated the PermissionsEx API to the latest version 1.20.4
Updated zPermissions API to 1.1.1

Updated the zPermissions API to the latest version 1.1.1
Updated Vault API to 1.2.31

Updated the Vault API to the latest version 1.2.31
Updated WorldGuard API to 5.8

Updated the WorldGuard API to the latest version 5.8