add params parser and psr-4 composer loading
fix namespace problems in PropertySuggesterHooks
fix autoload
fix hook not called - some changes might not be necessary
add PropertySuggester.php to composer.json
test InvalidParams
split tests
throw exception if item can not be found
test invalidArgumentExceptions
remove api dependency
Merge branch 'psr4' of https://github.com/Wikidata-lib/property-suggester into psr4

Conflicts:
	tests/phpunit/PropertySuggester/SuggesterParamsParserTest.php
add @throws + remove api dependency
fix
Merge pull request #56 from Wikidata-lib/psr4

Psr4