multiple file selection not reflected on label

[erodriguezh]

On the input file multiple the label does not reflect the number of files chosen, it just remains as "No file chosen".

I found this issue in the version 1.2.1, however you can reproduce this issue in the current example: http://valor-software.com/ng2-file-upload/

Actions Performed:

1. Go to the multiple file input
2. Select a bunch of files

Expected Result: The label should change from "No file chosen" to "X files". X being the number of files chosen

Actual Result: The label remains as "No file chosen"

Additional Info: On the single file input, when a file is chosen, the label shows the name of that file.