Check for a valid i13nNode before accessing it

#41 - Check for a valid i13nNode before accessing it (thanks @kfay)

update i13n model when props changes

#39 - update i13n model when props changes

bump object-assign and better error handling

#36
#34

bug fix, remove default value of followLink

#32 - bug fix, remove default value of followLink, so that the value of follow can be taken.

Enhance performance of viewport detection

#31

more error handling

#29 - more error handling

new interface for eventemitter

#27 - new interface for eventemitter

pkgs update

#24
#26
#25

add utils function and pass via props and context

#22 - more detail please refer to https://github.com/yahoo/react-i13n/blob/master/docs/guides/utilFunctions.md

support auto scan

#18 - support auto scan