Implement move constructors

[bstaletic]

Things like Database and Statement leverage RAII and own some kind of object, so it makes sense to make them non-copyable. However moving them around should be supported. Consider the following:

class DatabaseWrapper {
        SQLite::Database db;
        SQLite::Statement query;
public:
        DatabaseWrapper() : 
            db(":memory:", SQLite::OPEN_READWRITE | SQLite::OPEN_CREATE)
            // The following line doesn't work - "Table" still doesn't exist
            // , query(db, "select * from Table where X = ?")
        {
                SQLite::Transaction tr(db);
                db.exec("create table Table (X varchar)");
                tr.commit();
                // Can't use copy assignment to innitialize `query`
                // query = SQLite::Statement(db, "select * from Table where X = ?");
                // No move constructor provided
                // query = std::move( SQLite::Statement(db, "select * from Table where X = ?") );
        }
};

I was trying to use this to save time constructing the Statement in a tight loop.

[SRombauts]

Yes, it totally make sense!

At the beginning of the project I was using VS2010 Pre C++11 but now I could even make a V2 full C++11 kwas always the plan)

[SRombauts]

Also, Database received a move ctor recently :)

[SRombauts]

Ok, so the first thing to note is that the Database move ctor introduced in #157 is guarded by #if __cplusplus >= 201103L, which sadly does not work with Visual Studio.

Second thing is there is no unit tests nor examples to this.

I'll work to improve this asap, and then complete other classes with such move semantics as appropriate.