Scala 2.11 fixes, added function to ExeWriter trait, building import section more sanely

fixes #6
Made BoundImports return a ImportNameTable directly
Instead of thinking of the INT/IAT tables as just one big table, we now correctly break them apart.
Created 'ThunkArray', and the INT is a sequence of ThunkArrays
2 passes - first one places, second one writes
The thunk arrays are correctly being positioned
importedDLLname position is being resolved!
Imports section is pretty clean now
Imports now use a two-pass positioning stage