Add handlebars to Makefile, PHP instead of HTML

Makefile now takes into account Handlebars templates in templates/ and
compiles them accordingly (using the ember-precompile npm module). Also,
instead of the ordinary HTML files there are PHP files that are run
using the PHP interpreter and their output is recorder to the output
.html file. I did this to avoid duplicating HTML files for debug and
release configurations, and it also makes adding new script files less
tedious. Some other minor changes have also been added.
Some small changes to the clean.bash script

To delete everything more thoroughly, I had some problems with leftover
build files
First commit of the bare-bones webapp

Just the header and the headlining posts have been converted into
SCSS/HTML/Handlebars and hooked to Ember.js, but no dynamic updating
takes place now. So let's just wait and see what I have in store for
you.