JsonApi.org format support - Add model option
Fixed first spec scenario - find function
Implemented jsonapi on relations, savings, and fetching
JsonApi format support for create and update resources
JsonApi.org format support - Add support for post/put methods on saving
added support for legacy ruby version gem requirements
Update her.gemspec

Add activemodel and activesupport dependency back
There are no changed_attributes for a #find.
Set previously_changed attributes when #save is called.
Always set @changed_attributes to {} after initializing.
Fix spec indentation.
Remove duplicate condition in “or” clause
Remove redefined “respond_to?” method
Merge pull request #183 from remiprev/fix/remove-custom-respond-to

Remove redefined “respond_to?” method
Remove travis tests for ruby-1.8.7
Actually test the send_only_modified_attributes functionality
Merge pull request #184 from remiprev/fix-parse-spec

Actually test the send_only_modified_attributes functionality
Add comment in middleware examples
Show changes for a new record, but not an exiting one.
Merge pull request #182 from centro/master

Set the ActiveModel::Dirty #changed_attributes and #previous_changes correctly.
Failing spec
Do not require foreign key for belongs_to nested models
Fetch many instances by id on a single request.

Some times you'd like to find many instances by id
with a single request. Using `where(id: [1, 2])` is
most likely the way rails people would try to do this.
So I just fixed Her to treat `id` as yet another
request param if its value turns out to be an array.