Add `isdynamic()` function

Merge pull request #6 from Keno/kf/isdynamic

Add an isdynamic function

Use `AbstractString` not `String` in most methods

v0.1.2

Use `AbstractString` instead of `String` in most methods

Remove `unpack()` export

v0.1.1

Improve printing and remove unnecessary `unpack()` export

Initial Release

Initial API set out for ELF, MachO and COFF files