Squashed 'src/univalue/' changes from 87d9045..5839ac3

5839ac3 Merge pull request #13 from theuni/move-lib
3f248e0 build: move libunivalue.la to the root dir
a68aed5 Merge pull request #12 from jmcorgan/add-ignores
81cafe3 Update and consolidate git ignores

git-subtree-dir: src/univalue
git-subtree-split: 5839ac3311792f80b9cd5070440c2256e0e69e13