Run should not watch hidden files

[dtopuzov]

Steps to reproduce:

Start tns run android on hello-world JS project.
vim app/app.css

Result:

Transferring project files...
Successfully transferred .app.css.swp.
Refreshing application...

And watcher start restarting app even before I edit something.

Moreover, when this hidden file disappeared I started receiving this on the console:

Unable to sync files. Error is: Multiple errors were thrown:
ENOENT: no such file or directory, stat '/Users/topuzov/Git/nativescript-cli-tests/TNS_App/platforms/android/src/main/assets/app/.app.css.swp'

[Plamen5kov]

should be fixed by: #2508