add a little cmap
Merge branch 'phemmer' of github.com:phemmer/ruby-corosync into phemmer

* 'phemmer' of github.com:phemmer/ruby-corosync:
  add a little cmap
fixup cmap
fixup cmap
add standard cs_error_t error handler

this was prompted by the fact that calling CPG#send can sometimes result in :err_try_again, and we need to try again. But instead of handling it on just CPG#send, we handle it on all calls.
fixup
Handle exceptions from nested corosync function calls
fixup cmap