CRS draft version 0.7a. Note: VERY BIG changes.

- Removed remarks in filesystem tree.
- Removed "packages.yml?since=...".
- Removed platform-specific directories.
- Removed version.yml.
- Removed YAML 1.2-specific compatibility and changed to only "YAML".
+ Added repository version to packages.yml.
+ Allow addition of additional files which will be ignored by the client.
+ Added version-specific metadata overrides.
+ Added resolvers documentation.
+ Added real patches.
~ Merged metadata.yml with packages.yml.
~ Merged version.yml with packages.yml.
~ Changed how resolvers work (see example and now existing documentation of resolvers).
~ Changed packages.yml example to old YAML syntax. Not needed this way though.
~ More detailed description of metadata.