Add flush function for connections

Add flush for connections and objectserver.

Change-Id: I2f8c44186d500d92d19483baf7cb1cfa44b1a803
Signed-off-by: James Feist <james.feist@linux.intel.com>

Imrprove boost-dbus high level interfaces

This commit has been squashed fromt the dbusproperties branch, and adds
quite a few pices of functionality.

1. Template called element_signature that can s

Imrprove boost-dbus high level interfaces

This commit has been squashed fromt the dbusproperties branch, and adds
quite a few pices of functionality.

1. Template called element_signature that can sucessfully map complex
c++ types (like std::vector<std::string, variant>) to their equivalent
dbus signatures at compile time.
2. Implements a high level dbus interface that exposes properties,
objects, and interfaces as first class c++ objects, and manages their
lifecycle correctly. See unit tests for examples.
3. implements variadic template registration for lambda functions, such
that function prototypes are automatically determined at compile time,
thus removing the requirement to do this by hand for each interface.

Change-Id: I43efed4fc63f7e2d69ac85918e0f6d3011a12d86

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Fix memory leaks

Dbus wants to manage its own memory, which is difficult to coerce
with smart pointers. This patch fixes the places where the smart
objects were getting destroyed, but the dbus ref

Fix memory leaks

Dbus wants to manage its own memory, which is difficult to coerce
with smart pointers. This patch fixes the places where the smart
objects were getting destroyed, but the dbus ref count was never going to
zero

Change-Id: I47d8a58387766c376d2e3b61671b5d82977c80e0

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Implement variadic templates for pack/unpack

As well as update unit tests to use variadic pack and unpack.

Fix error handler to not seg fault while processing an exception

Change-Id: I7978035c2682

Implement variadic templates for pack/unpack

As well as update unit tests to use variadic pack and unpack.

Fix error handler to not seg fault while processing an exception

Change-Id: I7978035c26820b35e64487e4afd9f1312bcd8225

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additions to make method calls work

Add method call framework (not much needed) and a unit test for method
call implementation (i.e., listening for a method call).

Basic dbus cleanup

merging changes from @cawka to close #20

Refactored C-API calls out of connection_service.hpp

connections are private by default now

discussion in issue #18

Added explicit asynchronous start function

A `connection` can operate synchronously, which
involves less overhead. It will be in a synchronous-
only state when it has been newly constructed or cance

Added explicit asynchronous start function

A `connection` can operate synchronously, which
involves less overhead. It will be in a synchronous-
only state when it has been newly constructed or cancelled.

`dbus::impl::connection::start()` begins/resumes
asynchronous operation, and should be called automatically
whenever an asynchronous operation is requested.

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simple impl::connection