Add Admin Capabilities

• Add Admin Event Booking capabilities - #119

NUS USC Page Updates

• adds CTPH calendar shifting notification - #118
• changes cache-ing style of Firebase deployment - #106
• removes CTPH option from the normal event form - #103
• adds contributing guide - #62
• fixes linting - #35
• adds cursor pointer for all navbars buttons - #33
• adds Travis CI - #20