FigureServiceTest: new test stub

Test is now based on scalatest instead of spec2
Figures: add support for figures to existing classes

Assets now generate figures and attach them to abstracts
AbstractService handles figures on delete
FigureService: implement all methods (untested)
gitignore: exclude figures from git
Assets: fix small bug in assets generation for figures
FigureService: fix some bugs
FigureServiceTest: all test implemented and running
Merge pull request #36 from asobolev/master

Conference controller: non-authorized methods

LGTM
Merge branch 'andrey'
Merge pull request #37 from stoewer/master

FigureService: implement methods and tests
Merge pull request #38 from asobolev/master

Conference controller with all methods (tests are coming)

LGTM
Merge branch 'master' into andrey
draft for the conference controller tests