adding support for google calendar recurring event insertion
Merge branch 'master' of github.com:yogeshjain999/office_automation_invoice

Conflicts:
	Gemfile
	app/assets/javascripts/office_automation_invoice/invoice.js.coffee
	app/controllers/office_automation_invoice/invoices_controller.rb
	app/models/office_automation_invoice/invoice.rb
	app/views/office_automation_invoice/invoices/_invoice.html.haml
	app/views/office_automation_invoice/invoices/_item_table.html.haml
	app/views/office_automation_invoice/invoices/create.js.haml
	config/initializers/simple_form.rb