Fix as discussed in /pull/39

Discussed in : https://github.com/jpillora/node-edit-google-spreadsheet/pull/39
Basically: support for batch entry + send without entry (as a failsave) 

Btw: Sorry for the diff-mess. I'm not sure why the diff shows all lines displaced by 1 linenumber :/
If you know how to correct this, I'll be happy to fix.