Add signals. Fix issue#1. Add macros for EP value. Refined test case.

Move sub-Funk handler out of Continuation struct.

Switch back to C version. Only dynamic memory supported, that is, the

FUNK object automatically allocate itself on heap and release memory
when finished.

The joking version number. Still in vehemently changing state.

1. C++ version is prefered.
2. Only one function is required. Rely on compiler optimization for
efficiency.