Replace all the example with tagFilters and numericFilters by the new unified filters

  Update README Scala
  [This list might not be relevant]
  Clarification of the filters default attribute name

Merge pull request algolia#59 from algolia/js/examples

docs(js): Give more emphasis on using autocomplete and instantsearch
docs(js): Give more emphasis on using autocomplete and instantsearch

We would like people to use autocomplete and instantsearch instead of
building their UIs manually, so I'm giving a bit more emphasis on
those libraries in the doc.

docs(js): Improve cache documentation

I realized that the previous `cache` documentation was a bit succinct,
so I just expanded it with more context, explanation and examples.

  Update README Scala
  [This list might not be relevant]
  Merge pull request algolia#64 from algolia/ruby/backup-anchor

Fix the anchor to the backup section

  Improve the examples of filters with tags by specifying '_tags:'
  [This list might not be relevant]
  Improve the examples of filters with tags by specifying '_tags:'

Fix markup on Android