Adds 'reload' button to the map when controls are toggled on

[ahmadayubi]

Adds a reload button that takes the map back to the initial state, closes #119
Using reload as the label rather than using home is consistent with what the function is called in the context menu.

[Malvoz]

I understand that it's probably a convention to name a button with the functionality to reset to the initial location/starting point "home", but in the context of a web map I think that's unfortunate, it could be confusing to users with screen readers, they may interpret this as a button for locating their own home. Can we use something else?

[prushforth]

The intent of the 'home' button (a little 'house' icon is a common visual metaphor these days) is to reset the map to the original zoom / lat / lon maybe without changing other conditions (such as opacities, new / added layers etc., tbdiscussed). What would be an appropriate role/label for such a function?

/cc @shepazu

[Malvoz]

What would be an appropriate role/label for such a function?

The best I can think of is "Reset to initial location/view". "location" may make less sense in non-geo maps though.

[ahmadayubi]

In the context menu its known as reload, would that work?