Implement #152, denoting whether or not boost is built embedded
Merge pull request #152 from PDAL/issues/152-is-embed-boost

No way to tell if embedded boost was used at runtime
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[skip ci]
provide implementation for plugin versioning #154
Merge pull request #155 from PDAL/issues/154-plugin-versioning

provide implementation for plugin versioning #154
Remove note about pdal.hpp from docs — DNE

I'm not sure if this documentation note should be replaced by something
else (another header that should always be included first).
Merge pull request #156 from gadomski/doc-fix

Remove note about pdal.hpp from docs — DNE