Fixed dependency warning issues

[raykao]

1. remove jade and update to pug

npm uninstall --save jade 
npm install --save pug

This will remove depreciation warning for jade and transformers. The issue being that jade used an older version named transformer and pug now uses jstransformer...so two birds one stone with the update to pug from jade.

2. Minimatch error is an issue with the png-file-stream dependency on glob-stream which depends on an old version of minimatch. You can get rid of the error by manually changing the package.json for glob-stream to point to the newer 3.0.2 version...but don't bother unless it's completely necessary. This should be an issue flagged with the repo for either or both glob-stream and/or png-file-stream to update their dependencies (package.json)

3. to further update jade to pug you'll need to update:

edit server.js line 15:

app.set('view engine', 'jade');

to

app.set('view engine', 'pug');

will need to rename file extensions in folder views/ from *.jade to *.pug

in bash you can run the following command in the views folder:

rename "s/jade/pug/" *.jade