fix adapter and revslimit options when creating a new db

[kasperstorgaard]

When creating a db, it seems that the adapter and revsLimit options have been switched, leading to wrong values when using either.

app-pouchdb/app-pouchdb-database-behavior.html

Line 60 in c06d7f0

computed: '__computeDb(dbName, adapter, revsLimit)',

...
db: {
  type: Object,
    computed: '__computeDb(dbName, adapter, revsLimit)',
    notify: true
  }
}
...

app-pouchdb/app-pouchdb-database-behavior.html

Line 230 in c06d7f0

__computeDb: function(name, revsLimit, adapter) {

...
__computeDb: function(name, revsLimit, adapter) {
...

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[kasperstorgaard]

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