This commit makes the following changes:

There are two sensible defaults for building boost libraries: build all of them
or build none of them. Previously the Spack boost package took the first
approach. This commit changes to building no libraries by default. The user can
specify which libraries they need using variants (e.g. +iostreams to compile the
boost iostreams library). If no libraries are built then a header-only install
is performed (no compilation, just copy header files to prefix). The consequence
of this change is that packages which specify a dependency on boost may now fail
(until they are updated to specify exactly which boost libraries they need
compiled).

The user may now specify whether to build shared libraries (static libraries are
always built) and whether to build libraries with/out multi-threading support
(default is to only build with multi-threading support).

The executable on the user-config.jam toolset line is set to Spack's cc script.
Before, without this, the desired toolset was used but Spack deferred to the
boost build system to choose the compiler version.

bzip2 and zlib are always specified as dependencies when iostreams is built
(before this could be controlled with the +compression variant).

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