Simplify Is-int function

https://github.com/tctcl/ballistic/pull/24
Simplify Is-Float Function

https://github.com/tctcl/ballistic/pull/25
Simplify Is-inf function

https://github.com/tctcl/ballistic/pull/26
Simplify Is-prime function

https://github.com/tctcl/ballistic/pull/28
Merge pull request #1 from thejameskyle/master

Simplify number type functions