Almodovar multiplatform client

This PR implements multiplatform support for almodovar and removes server side code, Basically:
* it removes the dependency with patron, replacing it with [httpclient](https://github.com/nahi/httpclient) 
* it removes server side code, which is now implemented by [almodovar-server](https://github.com/bebanjo/almodovar-server)

This PR is a much simpler version of #11 that avoids the cumbersome of conditional code among platforms.