change build code to use gulp-filter 3.0

[e-oz]

npm module gulp-filter version 3.0 has backward-incompatible changes, this commit fixing it

[e-oz]

tests failure is not related to this commit.

[Swiip]

It's our shrinkwrap mechanism which prevent updating the dependencies.

Could you:

node test/template-cli deps
cd test/tmp/deps
rm -rf node_modules
npm install
npm shrinkwrap
cp npm-shrinkwrap.json ../..

And commit the file? We should definitely write doc about that... and make a script...

[e-oz]

I did it, tests are failed again because of dependencies.
Changes in this commit are pretty simple, easy to observe. Feel free to decline pr, my aim was just to warn you about critical changes in gulp-filter.

[Swiip]

This failure is actually a real one. You successed fixing the shrinkwrap thing but there is a use of gulp filter you miss: https://github.com/Swiip/generator-gulp-angular/blob/master/app/templates/gulp/_styles.js#L68

[e-oz]

Really, my fault, sorry.
Thanks for checking it.

[Swiip]

Yet another problem, doesn't understand this one...