include build status in the readme
use urljoin to get the registered URL

- get more robust url parsing
- specify the scheme (http[s]) in the HTTP_ENDPOINT config var
fix the irods url created for replication

use the urlparse module's ParseResult type to represent the destination
url in the context. this allows us to easily take parts of it and create
the irods scheme replication url. we can also use urlparse and
urlunparse to switch between string and complex representations.
it doesn't support the irods:// scheme though, so we have to construct
that by hand.
added the EPIC_* config vars again

use HANDLE_* to read from the handle service,
use EPIC_* to write to the handle service,
use HANDLE_PREFIX in all cases.
fix the replication

adapt the replication function to use the right contents (irods url) and
put it to the right place (http url)

changes the function name get_replication_filename to
get_replication_path to be more accurate
use the var name HANDLE_PREFIX over EPIC_PREFIX
Merge pull request #87 from mhellmic/master

fix the registration and using the http api for backend access