npm install -d error: destination path `ng-cordova` already exists

[felquis]

If I run npm install -d twice, it will cause an error:

[giorgiofellipe]

@felquis What do you think is better? if already exists

• keep as it is
• update git pull
• anything else

[felquis]

I think we should remove gulp install-source-module from postinstall. Then we could pull if it already exist.

[giorgiofellipe]

@felquis we've added this to postintall again, so I'll fix it by checking if there's already a folder, if true I'll try to do a pull