Added /exp bottle <amount> command that allows you to create an experience bottle from your XP. You can use the command with an empty bottle in hand, or on a single bottle o' enchanting.
There is an option to allow creating an experience bottle out of thin air as well.
Added feature enabled in the config file to modify experience drops when a player dies. If enabled (by default) it will drop an XP orb with a percentage of the player's experience upon death and zero out their experience. This option can be disabled to use vanilla behavior (drop 100 XP, regardless), or the behavior of other plugins (i.e. keep XP on death).