Apply MyModel.fullTextIndexes system to map-reduce views

[aenario]

I think this way is easier to explain ("You put a model in server/models") than the previous one ("You need to add an entry in server/models/requests which points to a file in the same directory").

I also think we should allow mapreduce views definition in the same way for cozydb v1.0, something like :

class MyModel extends CozyModel
     @docType: 'foo'
     @schema: 
           "bar": String
     @fullTextIndexes: 
           "bar": nGramLength: 1, stemming: true, weight: 5, fieldedSearch: true
     @mapReduceViews:
          "all": cozydb.defaultRequests.all
          "complex": 
               map: (doc) -> emit doc.a / doc.b
               reduce: "_stat"

[clochix]

@aenario You referenced this issue in #51. Has it been resolved, or does it need some more work?