Update tilecloud and tilecloud-chain to latest version
Merge pull request #1016 from camptocamp/tilecloudchain

Update tilecloud and tilecloud-chain to latest version
Update to tilecloud chain 0.8.2.

The version 0.8.0 doesn't want to install.
Merge pull request #1018 from camptocamp/tilecloudchain

Update to tilecloud chain 0.8.1.
Adding support for relation between functionalities and themes. Also add 'theme_basemap' functionality.
Use default_basemap for theme functionalities instead of theme_basemap + theme functionalities are arrays