2DC46AD76277039F1B65FE3C7F2064788B1C12FE701CFE7EC93F751586A48781)

will add a test after #42 gets merged

 2DC46AD76277039F1B65FE3C7F2064788B1C12FE701CFE7EC93F751586A48781)

will add a test after #42 gets merged

* Use concrete basic types for time, hash, bytes, validator id

* cargo fmt

* into_iter unnecessarily moves the Vec (clippy)

* Resolve a bunch of clippy warnings about:
https://rust-lang.github.io/rust-clippy/master/#try_err

* make the lite client a module instead of a separate crate:

This is just the simplest way to move forward implementing the traits of
the lite package. There are alternatives:
We do not want a create a circular dependency between lite and
tendermint (which does not even compile). To avoid this we could:
1) make lite a module of tendermint, or, 2) replicate a lot of the types
of the tendermint crate in the lite package (e.g. Time, Ids etc), or 3)
have a dependency from tendermint to the lite package only (but then the
trait impls do need to live in the lite crate instead with the types in
the tendermint crate directly).

* add amino type for header Version

* working towards hashing the header: conversion between fields and their
respective amino types, and, directly encode some

* Header::hash works now (tested against JSON fixture only and yields:
 2DC46AD76277039F1B65FE3C7F2064788B1C12FE701CFE7EC93F751586A48781)

will add a test after #42 gets merged

* remove todo

* implement lite::Validator trait

* implement lite::ValidatorSet trait

* implement lite::Vote trait

* bring back BufMut; fix clippy warnings

* Address some review comments:

 - Consistency: Rename encode_bytes to bytes_enc
 - remove redundant return statement

* Consistency: From<&vote::Vote> same order as the fields in the struct

* deduplicate encoding a hash: add a helper

* deduplicate encoding hashes and varints: add a helper for each

* simplify sign_bytes to return Vec<u8> instead of passing in a BufMut

* Add test for lite::Header.hash() in rpc tests

* wrap the CanonicalVote in a struct that contains the validator ID
and the signature