Fix decimal processing
Null values are explicitly inserted in CqlInsert queries
Protocol v3 schema change event support CSHARP-145
Merge branch 'decimal' of https://github.com/medvekoma/csharp-driver into medvekoma-decimal
Tests: More decimal values
Merge branch 'insert_nulls' of https://github.com/medvekoma/csharp-driver into medvekoma-insert_nulls
Tests: fixed linq insert null test