chore(README): it is Go not go
fix(README): cleanup wording on first etcd run
chore(README): simplify explanation of the Index field
chore(README): un-nest the sections
fix(README): misc language cleanups

Reduce the number of words and cleanup the language a bit.
feat(README): add a tools and libraries section
Merge pull request #75 from philips/cleanup-README

README: misc cleanups