Create FbError class

[asfernandes]

Create a class to represent a Firebird exception which its status codes and strings.

asfernandes/node-firebird-driver#1

[gsbelarus]

It definitely has to be solved as FB server error messages differs for Mac and Windows platforms.

[asfernandes]

Differ in what sense?

[sywka]

The sql errors are the same, but for some cases the errors from the driver may differ for different platforms.
For example, connection to a non-existent database.
For mac the error message is ... No such file or directory and for windows this is ... The system cannot find the file specified.

[marcin-bury]

Are there any chances to "dust off" this issue and implement this FbError class?