CHANGELOG

- `driver::ws` changed to `driver::io`
- sending scaler types using operator<< is now supported
- string literals supported by `mathematica::m`
- LibraryLink compatibility added
  `mathematica::connector` can now be constructed from native `WSLINK` or `MLINK`
  is a connection is created using an existing native link it will not be closed in the destructor
- issue #4 serialize struct
  added `MATHEMATICA_ASSOCIATE`, `MATHEMATICA_SEQUENCE` and `MATHEMATICA_TYPEMAP`
  see test association
- issue #3 support for multiprecision string
  integers larger than machine size are fetched as string and are stored with an initial `#` character
  Similarly strings strating with `#` character are treated as large integers while sending input to mathematica
- issue #1 bulk IO support
  supported `std::vector`, `Eigen::Matrix` (optionally if available) 
  PutIntegerNArray functions are used if enabled using runtime flag `mathematica::bulk_io`
  use `shell.enable(mathematica::bulk_io)` see http://community.wolfram.com/groups/-/m/t/1419096
- issue #2 `MathLink` support
  added cmake option `-DWITH_ML=ON` to use `MathLink` instead of `WSTP`