CLIENTAPI-8: Can't get columns/column names from a result table
CLIENTAPI-8: Can't get columns/column names from a result table

Adds SWIG directives for generating PHP code for voltdb::Column. Also encapsulates C++ voltdb::Column instance variables within getter methods.


creative-quant/voltdb-client-cpp,creative-quant/voltdb-client-cpp,creative-quant/voltdb-client-cpp,creative-quant/voltdb-client-cpp