Allow to pass search params to directive

Allows to pass a search param object to the directive for easier sorting or filtering. Just use the same data structure as you would use with $http or ngResource.

Fixes #20
Update readme for search params

See #20
Merge pull request #31 from dnauck/master

Reload on URL changes on page '0'
Regression test for reloads induced by url change
Release v2.4.1
Merge pull request #32 from dnauck/searchparams

Searchparams
Add test for url-params, and correct the docs
Release v2.5.0
Accept custom headers (plus regression tests)
Release v2.5.1