add client files
remove JSON.stringify for ajax params
fix for signin and sign out
add language configure
Merge pull request #4 from nikuuchi/porting_client

Porting client
added getDCase API
Merge pull request #5 from assureit/api_getDCase

added getDCase API
added getNodeTree API
Merge pull request #6 from assureit/api_getNodeTree

added getNodeTree API