Bug fixes, once again

• Fixed entities not spawning
• Fixed shulker and shulker bullet not parsing correctly (relates #110)
• Fixed creative gamemode being parsed as inventory action (closes #111)
• Fixed toggle effect on 1.8 doors, and iron trapdoor (closes #114)
• Fixed speed expression not working as expected (closes #115)
• Updated WorldGuard (relates #108 )
• Fixed authors in plugin.yml, which also allows detecting if Skript is using my fork (relates #120)
• Added support for soft exceptions, as config option (closes #120)
• Added expression for entitys glowing state (closes #91)

Expressions:
toggle now supports 1.8 doors, iron trapdoor and fence gates
walking/flying speed now supports adding, removing and reseting it
Glowing: glowing [of entities]; can be set and reseted