Added llvm intrinsics for round and nearbyint + complex sqrt, ceil, floor, round, nearbyint
use to_i32 and to_64 in Float32 and Float64 methods
Cleaned up rounding after learning about LLVM rounding functions
Merge pull request #255 from scidom/master

Wrapper to LLVM round, sign for numbers, sqrt, cis, ceil, floor and round for complex numbers