Python binding for more read result types
in Python, copy read results when storing

avoids invalidating shared pointer
add segment combination methods in Python API
delay XML initialization
Python API for germline segment info
add comments to Python bindings
add V-J junction region
SAX parser (in progress)
SAX parser (in progress)
SAX parser (in progress)
SAX parser (in progress)
SAX parser (in progress)
parse version string
XML node vocabulary structure
XML parser (in progress)
XML parser (in progress)
XML parser (in progress)
XML parser mostly works
XML parser works
vdjml example file