change license to GNU 2.0
Update operation.rb

fix a bug

param change to params
Merge pull request #1 from FBSENDER/patch-1

Update operation.rb
Update account.rb

operation account add keyword methods
Merge pull request #2 from FBSENDER/patch-2

Update  operation account
add report method to Operation::Account which only support baidu and sogou. Better layout in API::Report.
change liscen
change version
Add report method to account; fix typo status->state
Change default value in operation::report; Add debug print to operation::report
fixed a bug that date does not change
fix bug
add special spec for operation::baidu::report
small change
change report date API(todo:change the api of sogo and qihu)
erase duplicated code
fix a bug that query_report return pair report
resolve #3, add support for baidu plan isDynamicCreative param
fix #3. Set extended = 1 to allow change of isDynamicCreative, add correspond test case, some change of layout
modify api.sogou.report; todo:move report methods to api and implement them in all search engine