https://rust-lang.github.io/rust-clippy/master/#try_err

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).

respective amino types, and, directly encode some

 2DC46AD76277039F1B65FE3C7F2064788B1C12FE701CFE7EC93F751586A48781)

will add a test after #42 gets merged

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

and the signature

 - work in progress as we might want to let an inner function for the
   recursion
 - also we might simply want to use From to consume (or create a Vec)
   instead of changing the method signature (as suggested here:
   #57 (comment))

…h_from_byte_slices' into lite_impl

 direct vector initialization instead of going through &[&[u8]]

and correctly compute header hash when block id is empty.

Represent empty Hash with Option

Handle empty block id

Represent `last_commit` as `Option<Commit>`

Implement several utility trait

accept iff +1/3 of the voting power signed

…code (lite2) and

tests:

 - rename former verify method to verify_header_and_commit (might be obsolete)
 - make the expired method public to be able to use and test it from the outside
 - add some helpers to be able to deal with deserialization hickups
 - add a bunch of tests using @Shivani912's generator code (with minor modifications)