Added an option to break player shield instantly if he blocks a creeper explosion (add more difficulty).
Added a damage bypass for creeper explosion, in %, ranging from 0 (0%) to 1 (100%), in which that given percentage, the damage from a creeper explosion will bypass the player shield protection by that amount (you can now decide how much damage the shield blocks from creeper explosion).
Also, added an option to send the player a message via chat/title when that happens (the player takes damage from a creeper while blocking).
Bug fixes:
Fixed a bug with permissions, permission "msc.reload" got typoed as "msc.msc".