[FIX] fix Cython 0.20 compatibility issue

- This patch makes the code work also for Cython 0.20
- Cython 0.20 seems to be pickier with empty functions (e.g. still parses them
  instead of skipping them entirely)
- This patch removes an old, unfinished implementation of fit1d in EmgFitter1D
Merge pull request #660 from hroest/fix/cython0.20

[FIX] fix Cython 0.20 compatibility issue