remove squizlabs/php_codesniffer from dev-requirements #16

remove composer.lock #12

updated php-sap/interfaces to v5 and php-sap/common to v6

remove null config from provideIncompleteConfig() #9

update php-sap/interfaces to v4 and php-sap/common to v5 #8

switch composer dependencies to interface v3 and common v4

update assertions of DateTime and DateInterval returns

update assertions of DateTime and DateInterval returns

switch composer to interface v2 and commons v3

switch to interfaces v2 and commons v3 and remove composer.lock from …

…git ignore list