Implement the WHM Boost Spells

These were easy and well documented on BGWiki

Formula: Boost Spell Potency = floor( (Enhancing Magic Skill - 300)÷10 ) + 5

Source:
http://wiki.bluegartr.com/bg/Category:Boost_Spell
http://wiki.bluegartr.com/bg/Boost-STR
http://wiki.bluegartr.com/bg/Boost-DEX
http://wiki.bluegartr.com/bg/Boost-VIT
http://wiki.bluegartr.com/bg/Boost-AGI
http://wiki.bluegartr.com/bg/Boost-INT
http://wiki.bluegartr.com/bg/Boost-MND
http://wiki.bluegartr.com/bg/Boost-CHR
Also add the RDM Gain Stat Spells

These are the same thing as the WHM Boost Spells, but the single target version for RDM
Merge pull request #113 from starlightknight/whm-boost-spells

White Mage / Red Mage: Implement Stat Boost Spells