update IDs 27, 28, 66, 157

update rails aliases to match bukkit item names
Potion erroring and duration/power fix
Added /list [group] and some more detailed configuration regarding /list
fixes and addition of '*' to match all unmatched users.
Cleanup - Split /list into methods
Cleanup: Comment and simplify /list code - More to do.
Edit default config to not cause confusion.
Merge branch '2.9' of https://github.com/essentials/Essentials into 2.9
Allow potion clear/apply commands to work