Added support for most types of variables;
attempt to fix handling of default values for DATE/TIME columns by recognizing these and setting them to NULL
Added support for most types of variables in CFirebirdSchema;
Fixed type code for INT64
Merge pull request #8 from hannes42/master

attempt to fix handling of default values for DATE/TIME columns
Merge pull request #8 from hannes42/master;
Merge pull request #8 from hannes42/master;
Merge pull request #9 from edgardmessias/data_type

Added support for most types of variables;
Fixed indentation with the PSR-2;