Merge pull request #85 from jjb/boolean-redirect-option

change redirect option to be true/false, and default true
drops support for ruby 1.9
fixes a typo
Use faraday instead of raw net/http

main motivation: better redirect behavior with cookies, coming
in a subsequent commit

also it's nice to not have to depend on open_uri_redirections,
which isn't as actively maintained as faraday_middleware

in general it's a nicer api to work with and allows for adding
more features in the future
Merge pull request #87 from jjb/faraday

Use faraday instead of raw net/http
work in progress