Add typescript definitions

[nadavsinai]

just a simple typedef of your great lib. allows to use in typescript environment. if you want me to rebase I can do, I did all these commits on the online github editor ;-) and then cloned my fork... you can also merge with squash to get one commit into your history

i've also added a commit to relax node engine constrain since it gave me trouble when installing with Yarn tag version 1.3,0

I've now also added a fix for when this is installed globally on windows and the global npm packages are within \program files\npm... (for instance -really anything with a space) the powershell script would not run as the path was not quoted and it would try only to run the part with the c:\program .... tag 1.3.1

since I need this... I added the commits made by @brianantonelli (Cox-Automotive ) and tagged now with tag 1.3..2

[nadavsinai]

your CI config needs a touch... checking node 4 is a little outdated I would say, your tests run fine locally