Responsive navigation menu and loader HOC

[kellyjoe256]

Loader

• Created loading context which will provide a loading boolean value to descedant components needed to show whether a loading action is happening
• Created a generic higher order loader component that uses the loading context to indicate whether the wrapped component should shown or the loading component

Top navigation / Header

• The current top navigation is the same on all screen sizes.
• Fixed this by modifying the header to show a clickable menu which will be aligned to the left when the screen size is less than 768px