Fixing two issues with latest Node JS

[jsastriawan]

Hi Carl,

I am interested to use Hoard time series database as a storage for upcoming features I am working on Meshcentral. However I discover two issues, one is related to path.fileExistsSync that has been moved to fs.fileExistsSync and buffer_ieee754 reference (adding .js) extension.

I made this two changes and it seems working well with Node JS 6.10.1. Please merge this so that we can get a working Hoard library.

Regards,

Joko Sastriawan

[jnovack]

/opt # node -v
v6.14.4
/opt # node_modules/coffee-script/bin/coffee -c -l -b --no-header -o lib src
/opt/src/hoard.coffee:253:13: error: unexpected identifier
            updateArchiveCalls = []
            ^^^^^^^^^^^^^^^^^^

Doesn't build under node v6.14 and coffee-script v1.12.

Do you have ANY version which generated a good .js file?

I wanted to upgrade this to use Promises and ES6 (for fun?) but can't get it out of this GOD AWFUL CoffeeScript.

There's something funky in the updateMany section that CoffeeScript does not even like even when it's the sole function in the file.