Some cleanups and unit tests.
Partial tracer implementation (framework and bytecode instrumentation).
Tracer builder (trace assembling automata) implemented.
Simple trace encoder and decoder.
Simple symbol enricher class for adding missing symbols in tracer streams.
Move tracer (and some other) files to a dedicated package.
Simple trace file writer and trace printer.
Revamp unit tests, split tracer tests from spy tests, integration and stress test suites.
Integrate tracer components into agent.
Support for custom trace attributes.
Change communication between application threads and trace writer thread (now a queue), make trace file writer available via spylib.
Merge pull request #69 from jitlogic/rel081

Rudimentary tracer implementation.