add convert sha256 to string functions and update docs#22

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bitkevin wants to merge 6 commits intoElementsProject:masterfrom

Commits on Mar 31, 2016

fix "missing braces around initializer"
zhibiao.pan
committed
Merge branch 'hotfix/fix_compile_iss'
zhibiao.pan
committed

Commits on Apr 7, 2016

Merge branch 'master' of https://github.com/ElementsProject/lightning
zhibiao.pan
committed
bitcoind: add convert sha256 to string
zhibiao.pan
committed
docs: add install libsodium
zhibiao.pan
committed

Commits on Apr 13, 2016

add tal allocated object to be parent
zhibiao.pan
committed