Bug Fix and proxy and ssl_ca_path support

Hello chrisle, i'm using gattica  and i found a bug when passing a page title in filters with commas, so i fixed it escaping all commas that are passed into filters. I need to connect over a proxy, and the gem didn't also support that, so i resolve to add that support to. Finally when i did requests over proxy i found a error in ssl certificates, so i found a way to resolve that adding support for add the path for this CA's.
This gem doesn't support filters with or conditions, i'm encouraged to give this support to, but for that i'll to change the way that filters are passed... they can't be strings. 
The first commit that i did is in the name of Tiago, by mistake...