add __init__.py in cbgrn directory
add CybozuGaroonApi.__init__
add get_soap_endpoints method
add execute_soap_request method (TODO: add unit tests)
add tests for execute_soap_request method
Merge branch 'garoon-api-soap-query-execution'
combine requirements*.txt
update .travis.yml and tox.ini
remove --use-mirror because it is deprecated
minor code style fix
Merge branch 'combine-requirements'
update .gitignore
Merge branch 'gitignore-setup-py'