support 2.x ruby
added required support for queries
query correctly uses the specified item
name attribute can be excluded from queries
optional attributes can be used in queries
include queries in readme
Merge pull request #25 from carlesjove/queries

added required support for queries. closes #9
helper method for empty serializer
items' links include the required rel attribute
mv version to 0.2.0
Merge pull request #29 from carlesjove/v0.2.0

Version 0.2.0