removing bin/stanc and bin/print from Stan

#### Summary:

Removes `bin/stanc` and `bin/print` from Stan. A stanc compiler is now in src/test/test-models/stanc.cpp, but isn't part of Stan's source code.

#### Intended Effect:

Removes `bin/stanc` and `bin/print` from Stan and moves them to CmdStan.

#### How to Verify:

All existing tests should pass.

Make targets are no longer there.

#### Side Effects:

Stan will no longer have the compiler and print functions as executables.

This will make it easier to remove `std::cout` and `std::cerr` from the rest of the Stan code base.

#### Documentation:

Documentation has already been updated with the v2.3.0 release. 


#### Reviewer Suggestions:

Anyone.