Add maxZoom option to BingMaps
Merge pull request #2734 from elemoine/bingmaps

Add maxZoom option to BingMaps
Correctly generate child tile ranges for XYZ

Instead of incrementing and then doubling, calculate the child tile range by doubling and then incrementing.

With this change, tile coord [0, 0, 0] has the four following children:

    [1, 0, 0]    [1, 1, 0]

    [1, 0, 1]    [1, 1, 1]

Without this change, tile coord [0, 0, 0] had the nine following children:

    [1, 0, 0]    [1, 1, 0]    [1, 2, 0]

    [1, 0, 1]    [1, 1, 1]    [1, 2, 1]

    [1, 0, 2]    [1, 1, 2]    [1, 2, 2]
Merge pull request #2758 from tschaub/tile-ranges

Correctly generate child tile ranges for XYZ tiles.
Remove unnecessary newlines
Remove unnecessary parentheses
Fix documentation typo