Add Type(), IsNil(), & Blob() to type Value #64
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Previously it was impossible to access the sqlite3_value_type() function for a Value. Now this is exposed via Value.Type(). Additionally, it was impossible to know if a returned Value was actually nil, which can occur when ChangesetIter.New() has no change for the given column. Using any of the returned Value's methods would result in panic. Now this can be checked using Value.IsNil(). Also, Value.Blob() is now implemented. Issue crawshaw#61
According to the documentation, calling _value_text can change the length and type of the Value. So this must be called before asking for the length with sqlite3_value_bytes.
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Previously it was impossible to access the sqlite3_value_type() function
for a Value. Now this is exposed via Value.Type().
Additionally, it was impossible to know if a returned Value was actually
nil, which can occur when ChangesetIter.New() has no change for the
given column. Using any of the returned Value's methods would result in
panic. Now this can be checked using Value.IsNil().
Also, Value.Blob() is now implemented.
Issue #61