'prepare' and 'install' stanza are missing documentation

Metadata

Project: snapcraft
Number: #1663583
Type: issue
State: open
Author: ~3v1n0
Labels: —
Created: 2017-02-10 12:44:51.614781+00:00
Updated: 2017-02-10 19:36:38.533451+00:00
Closed: —

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Issue body

In snapcraft docs (not just snapcraft.io, also in docs sbufolder of master git repo) there's no documentation about the 'install:' or 'prepare:'options

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