[openstreetmap/openstreetmap-website] Remove quad_tile library and extract to gem (#1899)

[Benjamin Reynolds]

@benreyn pushed 1 commit.

98df31c  Fix TravisCI run


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1899/files/0a086596d1d04e347011cbc666f158c4e6c00a5a..98df31c198e9063b44a41b7f51178ae2bced9d82
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