Tilecloud-chain

1. Now the apache configuration can be generated with
`.build/venv/bin/generate_controller --generate-apache-config`, it support `filesystem` `cache` and
`MapCache`.
2. Windows fixes.
3. Use console rewrite (r) to log generated tiles coordinates.
4. Now if no layers is specified in `generation:default_layers` we generate all layers by default.
5. Now bbox to be floats.
6. New `--get-bbox` option to get the bbox of a tile.
7. Add coveralls support (<https://coveralls.io/r/camptocamp/tilecloud-chain>).
8. Add an config option `generation:error_file` and a command option `--tiles` to store and regenerate
errored tiles.

1. SQS config change:

yaml
layers:
layer_name:
sqs:
The region where the SQS queue is
region: eu-west-1
The SQS queue name, it should already exists
queue: the_name


2. Add debug option (`--debug`), please use it to report issue.
3. Now the `sql` request can return a set of geometries in a column names geom but the syntax change a little
bit =&gt; `<column> AS geom FROM <table>`