[wip] grading methods base files
[temp commit]
[grading_methods/lib]
[concern] grading method lookup
[WIP] debug and show results /WILL BE REMOVED
[fix] require base method
Merge branch 'master' of github.com:Genshin/GAKUEngine into grading_method_refactor

Conflicts:
	core/lib/gaku/core/engine.rb
[temp] reload/debugging for classes in lib
[fix] grading methods debug
[xit] failing specs in students feature spec
[assets] add select2 pluggin and make short function
[controller] fix typo in controller
[gem] select2
[view] add datepicker & select2 jquery pluggins
[spec/feature] simple grade enchance
[locale] simple grade type
Merge remote-tracking branch 'origin/fix_simple_grades' into implement_grading_methods

Conflicts:
	core/config/locales/en.yml
Merge remote-tracking branch 'origin/revise_student_views' into implement_grading_methods

Conflicts:
	frontend/app/assets/javascripts/gaku/frontend.js.coffee
Merge remote-tracking branch 'origin/grading_method_refactor' into implement_grading_methods
remove old grading cruft