preparing new release
Merge for 0.9.0-rc.1
merged back

(for easier updates in the future)
PSR-4 + Namespaces
updated dependencies
convert test-helper classes to PHP-5.3+ style
tweak class-names in strings
converted HTTP unit-tests to use namespaces
proper registration of literal-classes
namespaced classes for Format, TypeMapper
Converted Literal unit-tests to use namespaces
merged EasyRdf\Http\Exception
Ported tests for EasyRdf\Sparql
namespaced classes in err-messages
converted more tests
unit-tests for parsers
use ARC from packagist
unit-tests for serialisers
err-messages cleanup
use ZF2 instead of ZF1