selection with arrows and shift is enabled
enableSelection functionality added
Merge branch 'master' into npg

Conflicts:
	dist/ember-table.js
	dist/ember-table.min.js
	src/component.coffee
selection down with shift jump bug fixing
selection down with shift jump bug fixing
selection with keys fixes
Merge branch 'master' into npg

Conflicts:
	dependencies/ember-addepar-mixins/selection.js
	dist/ember-table.js
	dist/ember-table.min.js
context menu handler fixing
Merge branch 'master' into npg