added subtract
added divide function
added the add function
added lame log method
added exponent method
added cubed method
Square root function
added super
Merge pull request #1 from PhoenixRockit/logarithm

added lame log method
multiply entered
cubed method
merged exponents with log
Merge branch 'exponents'
merged brads code
Merge branch 'master' of github.com:PhoenixRockit/calc
merged
Merge branch 'super'
Merge branch 'master' of github.com:PhoenixRockit/calc
merged
Merge branch 'squareroot'