Added support for nested properties #11

[nockstarr]

Found my self needing support for nested properties so here is the code if you are interested.

Added method getDescendantProp(obj, path).
The method getDescendantProp is applied were applicable in vue-virtual-table.vue.

Executed build
Bumped package version

Example method usage:

// Access user.name
this.getDescendantProp({user: {name: "userName", age: 43}},  "user.name")
>> userName
// Access user.age
this.getDescendantProp({user: {name: "userName", age: 43}},  "user.age")
>> 43

[waningflow]

I will publish the new version later.

[waningflow]

Do you have skype or slack? We can communicate more conveniently.

[nockstarr]

No, sorry