Remove dependency on ipfs-api

[pelle]

• [x] changes nodew3c-xmlhttprequest library to be xmlhttprequest the same as web3 (also less broken)
• [x] implements format internally
• [x] uses GET for get requests

ipfs-mini

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[coveralls]

Coverage decreased (-1.6%) to 98.413% when pulling b4dc7e3d90b1704889642619681a11ab7c2da5b1 on pelle:bye-bye-streams into 362c5acb41632a29782be02d7832bbb5ef0aec9a on SilentCicero:master.