BREAKING CHANGE

change 4 assoc requests:

## getAssoc()

    GET /core/association/{id}
    ->
    GET /core/assoc/{id}

## getAssocByValue

    GET /core/assoc/by_value/{uri}/{value}
    ->
    GET /core/assoc/type/{uri}/{value}

## queryAssocs

    GET /core/assoc/multi/by_value/{uri}/{value}
    ->
    GET /core/assocs/type/{uri}/query/{value}

## getAssoc(String assocTypeUri, long topic1Id, long topic2Id, String roleTypeUri1, String roleTypeUri2)

    GET /core/association/{assoc_type_uri}/{topic1_id}/{topic2_id}/{role_type1_uri}/{role_type2_uri}
    ->
    GET /core/assoc/{assoc_type_uri}/{topic1_id}/{topic2_id}/{role_type1_uri}/{role_type2_uri}