[FIX] Adgroup - don't update adgroup keywords/adtexts when in update wasn't inserted into adgroup
[FIX] Keyword - when added nil -don't throw error on gsub :(
[FIX] Adgroup - allow to set keywords as array of SklikApi::Keyword
[FIX] Adgroup test - fortgotten statis ID of adgroup
[FIX] Send test logger output to log/sklik_api_test.log
Version bump to 0.1.5