[Rails-devel] Support for special tile and token lays

[Stefan F. <ste...@we...>]

As discussed before (for details see 
https://github.com/freystef/Rails/wiki/PrivatesTileToken) a few changes 
are now implemented for special tile and token lays.

Changes are:

1830 D&H:
Token lay possible only with a tile laid

Remark: Currently it only checks that "any" tile is laid. So the token 
lay would still be possible on a green tile or after a different company 
has laid the tile. However as the rules/interpretations are not clear 
here, I was reluctant to make the code more difficult.

1835 PfB:
Token lay possible only with a tile laid
PfB closes after token lay

Remark: As supported by the 2nd of the rules it does not matter who laid 
the tile. It is even possible to use the PfB tile lay with one company, 
and the PfB token lay with another.

18GA W&S:
The bug that W&S included a tile lay power is removed.

Remark: The token lay is still possible without a tile on the hex.
Next OR it is possible to lay a yellow tile.

1856 WS&R:
Nothing changed, token lay is still possible without a tile on the hex.

To implement this a new attribute to SpecialBaseTokenLay was added: 
requiresTile="yes" implies that a tile has to be laid first before the 
base token can be laid via the special power. Default is "no".

Stefan