change appkey to token and create url in _post method instead of send
change mail_type in sample.js
change mail_type in sample.js and remove duplicate decelaration of variable in client.js
Merge branch 'master' of https://github.com/bharat-dpd/sitback-node-client
Merge branch 'master' of github.com:bharat-dpd/sitback-node-client into bharat-dpd-master
Merge branch 'bharat-dpd-master'