use more portable syntax in configure script
fixed missing initialization

in constructor
extended broker and added simple(r) broker example

this patch adds the member functions `add_connection`,
`add_tcp_connection`, `add_acceptor`, and `add_tcp_acceptor`
to the broker class and adds the simple_broker example to
showcase the broker API without Google Protobuf overhead
updated documentation, updated ChangeLog
Merge branch 'master' into unstable
moved tuple_dummy to its own header
updated manual.pdf
fixed GCC build
changed version to 0.9.1
Fixed bugs in the opencl test

The test now works on GPUs with fewer than 512 work-items and
on iMacs with ATI GPUs.
fixed issue with serialization of empty any tuples
fixed initialization order in broker

this patch fixes a bug that could cause brokers to halt
refined `detail::valid_input_predicate`

this patch allows typed_behavior to handle multiple message handlers
using the same input types but different output types;
however, sync_send(...).{then|await} are not ready for multiple
result types yet
fixed memory leak in memory_cache
give more opportunities for work stealing
downgraded double KILL_PROXY msg warning to info

this actually has no effect on client code, but is merely a minor
libcppa issue, so it souldn't be a warning in the first place;
closes #126
handle invalid_actor in sync send + anon_send_exit

this patch checks in anon_send_exit for invalid_actor and
turns it into a NOP if needed, sync_send throws
std::invalid_argument to have at least a defined behavior
fixed performance issue with prioritizing policy

this patch fixes an issue with the prioritizing policy where the
low-priority cache could slow down the performance of dequeue
operations to the point where the system seems to stop;
this patch also removes the implicit addition of the priority_aware
flag whenever the detached flag is used
fix Windows MinGW64 build
Merge pull request #127 from debio264/windows-fix

fix Windows MinGW64 build