Fix the "drop" method.

Until now it was not used in any of the projects relying upon busybee.
Make "connect" nonblocking
Add PO6_CLFAGS to AM_*FLAGS
Update WANAL_FLAGS
Update WANAL_FLAGS
Fix clang warnings on OS X
Merge branch 'master' into releases/0.4

* master:
  Fix clang warnings on OS X
  Update WANAL_FLAGS
  Update WANAL_FLAGS
  Add PO6_CLFAGS to AM_*FLAGS
  Make "connect" nonblocking
  Fix the "drop" method.
Set version numbers for 0.4.1 release