added docs todo.
initial implementation of moment.

Also added tests. Currently the arguments `w` and `d` only do anything
when `cent`=True.
Merge branch 'master' of github.com:circstat/PyCircStat
now `moment` returns only the complex p-th moment

removed automatic return of magnitude and angle to make calling simpler.
implemented bootstrapping

Test function still needs work.
buggy push of decorators for moment

Do not merge back into main repo until fixed! This is a push so Fabi
can take a look.
made decorators signature preserving using decorator
Merge branch 'master' of https://github.com/tomwallis/PyCircStat
Merge pull request #1 from fabiansinz/master

made decorators signature preserving
decorator added to setup.py
Merge pull request #2 from fabiansinz/master

decorator added to setup.py
removed axis stuff.
added some more tests (that break)

can’t debug — decorators seem to stop me being able to use pdb or even
print statements…
fabi fixed theta tiling.
Merge pull request #33 from tomwallis/master

Added function `moment`