Add ability to invoke CoinbaseAccount with a known good oauth access token#10

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skruger wants to merge 3 commits intosibblegp:masterfrom skruger:master

Commits on Mar 1, 2014

Add ability to invoke CoinbaseAccount with a known good oauth access token. Support basestring type for api_key and access_token arguments.
skruger
committed

Commits on Mar 4, 2014

Update error message.
skruger
committed

Commits on Mar 12, 2014

Improve error messages and fix transaction id reference.
skruger
committed