Created UI to contact mailing list. Added Modal support and stand-alone page to routing
Merge branch 'Prototype' of https://github.com/my-koop/service.website into ad_mailing_list_send
Added documentation on props and made sorting optional on table sorter
Made filtering optional for table sorter
Can now choose how to generate a cell for each column
Refactor ListModButtons to support any kind of icons
CRUD Interface to manage volunteer availabilities
Clearfix for MailingListSendBox.
Allow to use text instead of a glyph for the button
Created helper class to create modals. Converted UserPrivilegesModal to use this helper
Merge branch 'Prototype' of https://github.com/my-koop/service.website into mike_refactor_table_sort

Conflicts:
	Koop/components/TableSorter.jsx
Merge branch 'Prototype' of https://github.com/my-koop/service.website into mike_refactor_table_sort
Refactored LoginBoxModal to use Abstract Modal
Adjusted parameter name after rename
Event signup modal
Merge branch 'Prototype' of https://github.com/my-koop/service.website into wizz_event_signup
Test
Allows nesting of overlay triggers with CustomOverlayTrigger component.
Allow to set tooltip props
Fix code convention
PR#126