test mediaheader too
separate hypermedia approaches
roll mediaheader parsing into the hypermedia package.
fill sawyer.Response’s Rels on Decode()
typo
bring that TODO back
remove Rels().  Relations should be accessed from sawyer.Response only
remove empty test
use Rels()
Merge pull request #13 from lostisland/hypermedia-responses

Hypermedia responses
merge
cache relations too
store expiration time, with default of 1h
make the memory cache the default cache
re-arrange