core: add provider, sparkline default, improve chart
doc: add ngdocs and dgeni documentation system

dgeni currently produces just partial view (need infrastructure).
ngdocs produces a semi-usable website.
fix(build): jshint Gruntfile.js
fix(build): improve doc gen
feat(sparklineDefault): improve sparkline, update HighCharts
Merge branch 'feature/all-charts' into develop
Merge branch 'feature/doc' into develop

Conflicts:
	src/providers/chartDefaults.js
fix(build): jshint