Added turtle command line tools turtle_parse.pl, turtle_benchmark.pl, and turtle_tokenize.pl.
Changed RT:spog:* keys to be a hash with node ID data for each quad position.
Added get_graphs as an alias for get_contexts in RDF::Trine::Model and RDF:Trine::Model::Dataset.
Merge branch 'rdf-trine-1.003'
Test to see if DBD::Pg is installed
Merge pull request #78 from kjetilk/master

Check to see if DBD::Pg is installed before running postgres tests.
Add POD for get_graphs method.
improve the error message when trying to parse an empty string
test for improved error messages
Merge remote-tracking branch 'kjetilk/parsercroak-proposal' into parsercroak
Move RDF/XML exception throw on empty input from parse_into_model() to parse().
encode data passed into parse()

This assumes parse()/parse_from_model() are intended to accept
characters, not bytes.
Merge pull request #82 from tonycoz/scalar-chars

Encode data passed into parse().
Updated VERSION and docs for 1.003_01 beta release.
Updated docs and VERSION for 1.004 release.
Merge branch 'rdf-trine-1.004' into release-rdf-trine