Update pack and unpack to be able to detect runtime errors

This commit makes a breaking API CHANGE! ! ! ! ! !
dbus message no longer supports streaming operators for unpacking and
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Update pack and unpack to be able to detect runtime errors

This commit makes a breaking API CHANGE! ! ! ! ! !
dbus message no longer supports streaming operators for unpacking and
packing.
This behavior seemed odd in the first place, and lead to some poor API
issues. It was also redundant to the much more used messsage.pack
which had far more features, and was much more useable. message.pack
now returns a bool, indicating whether or not the unpack/pack succeeded.
properties API is also updated to use this new interface to its
advantage, allowing badly formatted pack statements (which should be
expected at runtime) to not require throwing an exception to handle.

Change-Id: I8da22e19106f3c764acfea3db13adc974aa2cb9f

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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_

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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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

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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make changes for vernon

Basic dbus cleanup

Added streaming pack/unpack interface to messages

Added message factories

Added endpoint - closes #17

fix #3, minor other message enhancements