Fixes Minor Agility Enchant
Fixes Minor Agility enchantment on cloak due to wrong EquipedItemClass in DBC
Removes extra mods

Removes extra mods because they were related to TBC features such as PvP
diminishing returns
Closes cmangos issue #227
Fixed SMSG_SPELL_FAILED_OTHER

fixes the spell visual effect remaining after spell is interrupted
Fix by Evairfairy from SilverpineProject
Fix spirit based mana regen

Fix spirit based mana regen because mana regen was too quick, especially
with spells like innervate or evocate or when players have a high ratio
spirit/mana points.
Unlike TBC and later expansion, spirit mana regen values per class were
not stored in DBC in Classic but used formulas as described below
http://www.wowwiki.com/Mana_regeneration?direction=prev&oldid=103895
However, those formulas give regen values per tick, a tick occuring
every 2 sec, the returned value must be cut by half.
source: http://www.wowwiki.com/Talk:Mana_regeneration#Untitled
Merge pull request #46 from cala/manaregen

Fix spirit based mana regen
Merge pull request #45 from cala/cloakenchantagility

Fixes Minor Agility Enchant

Closes cmangos/issues#225
Merge pull request #47 from cala/interruptspell

Fixed SMSG_SPELL_FAILED_OTHER
Merge pull request #44 from cala/removeMods

Removes extra mods

Closes cmangos/issues#227