Add hyperdex.
Add python bindings for replicant.
Allow people to set the address model and toolset to boost.
Add in a test for boost.
Fix hyperdex python build.
Clean up dependencies.
Remove dot '.' from dependency.

This breaks because of https://github.com/hashdist/hashdist/issues/208
Merge pull request #176 from teh/master

Add hyperdex to hashstack.
Merge pull request #181 from robertmaynard/boost_toolset

Boost toolset
Hand-merge .travis.yaml

Also noting (courtesy Robert Maynard)

> I didn't clearly state this in the commit message but by explicitly
adding a CMake variable to the extra section it will override any of the
values that cmake_package sets. This happens because CMake treats the
last occurrence of a value is the preferred one, and I make sure to add
the extra section last.