Changelog for fb-1.2.0

Version 1.2.0

Rewrote fb for conduit-1.3.0
Fixed various warnings and did general cleanup
Fixed fetchNextPage/fetchPreviousPage test by adding ("filter", "stream") for comments api.
Made lower bound of http-conduit to 2.3.0

Make versioned call. By default now it uses `v2.8.
disassociateTestuser function added.
getPage_ function added which accepts AppAccessToken as opposed to getPage function.
Fixed a bug in getObjectBool
Travis CI added