Add a composer.json

Add a composer.json file to enable loading this library via composer.
This is necessary to make phploc/phploc work with composer installation
(see sebastianbergmann/phploc#35)
Fix composer.json name
Update composer.json

Per changes in https://github.com/theseer/fDOMDocument/pull/16
Merge pull request #1 from tommygnr/add-composer-json
Change name
Update email address
Bump copyright year
Prepare release
Depend on dev-master of fDOMDocument for now
Revert "Depend on dev-master of fDOMDocument for now"

This reverts commit d7132079f595b241b9a2153fa9aad63dff8c64b8.