Add support for namespaces.

For details of the new feature, see
https://github.com/luarocks/luarocks/wiki/Namespaces

This ended up being a huge commit because of some major refactoring
motivated by the new feature:

* new modules for some object types:
  * `luarocks.queries` - all functions that look for rocks in local or
    remote repositories now use objects constructed by this module:
    query objects contain the name, namespace and query constraints.
    Dependencies in a rockspec are also stored as query objects.
  * `luarocks.results` - all individual results produces from queries
    are returned in this format: result objects contain the name,
    namespace, version, arch and repo.
* the `results` object was renamed to `result_tree`, to better
  reflect that it is not an array of `result` objects.
* `luarocks.vers` was removed, its functionality was moved to better locations.

Specifically on namespaces:

* Commands that take a rock `name` can now take `namespace/name`
  (and alternately `--flags=namespace` so that URLs can be
  also installed with a nominal namespace).
* Rocks installed from a namespace now create a `rock_namespace`
  file alongside `rock_manifest`, which is used when matching
  namespaced dependencies against locally-installed rocks.
* Using namespaced dependencies in a rockspec, requires
  `rockspec_format = "3.0"`.
* Tests under the `#namespaces` hashtag, all using a local repository.

1 files changed, 1 insertions, 1 deletions

diff --git a/spec/show_spec.lua b/spec/show_spec.lua
index d572be9b..234a8a33 100644
--- a/spec/show_spec.lua
+++ b/spec/show_spec.lua
@@ -30,7 +30,7 @@ describe("LuaRocks show tests #blackbox #b_show", function()
       
       it("LuaRocks show modules of luacov", function()
          local output = run.luarocks("show --modules luacov")
-         assert.is.truthy(output:match("luacovluacov.defaultsluacov.reporterluacov.reporter.defaultluacov.runnerluacov.statsluacov.tick"))
+         assert.match("luacov.*luacov.defaults.*luacov.reporter.*luacov.reporter.default.*luacov.runner.*luacov.stats.*luacov.tick", output)
       end)
       
       it("LuaRocks show dependencies of luacov", function()