Scripts/Kelthuzad: move spells into spelldifficulty_dbc and cleanup
Scripts/ZulGurub: clean up the code and remove old hacks
Merge pull request #11787 from MitchesD/misc

Scripts/ZulGurub: clean up the old code
Merge pull request #11614 from MitchesD/kelthuzad

Scripts/Kelthuzad: move spells into spelldifficulty_dbc and cleanup
Rename 2014_02_15_00_world_spelldifficulty_dbc.sql to 2014_04_17_01_world_spelldifficulty_dbc.sql
DB/Creatures: Added trigger flag to the remaining triggers
Merge branch 'master' of https://github.com/TrinityCore/TrinityCore into ghbb