added support for legacy ruby version gem requirements
Update her.gemspec

Add activemodel and activesupport dependency back
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.
Allow middlewares to return hash with String keys.
allow parse_root_in_json's format option to be inherited
Merge pull request #194 from agrobbin/parse-root-superclass-format

Allow parse_root_in_json's format option to be inherited
Merge pull request #192 from kenips/symbolize_hash_keys

Allow middlewares to return hash with String keys.
Merge pull request #191 from vic/find_many_by_id_single_request

Fetch many instances by id on a single request.
Merge pull request #188 from monterail/belongs-to-nested-models-fix-for-missing-foreign-key

Belongs to nested models fix for missing foreign key
Merge pull request #167 from RevSpringPhoenix/master

added support for legacy ruby version gem requirements
Add Coveralls
Remove Coveralls, what