* Update to spec v0.9.0
* Update to v0.9.1
* Bump spec tags for v0.9.1
* Formatting, fix CI failures
* Resolve accidental KeyPair merge conflict
* Document new BeaconState functions
* Fix incorrect cache drops in `advance_caches`
* Update fork choice for v0.9.1
* Clean up some FIXMEs
* Fix a few docs/logs
- The Account Manager has a new subcommand, allowing generation of deterministic keys given a particular validator index.
- Split functionality in generate_deterministic_keypair function
- Fixed up READMEs to reflect new functionality & correct naming.
- Directory structure changed slightly
- Uses a filter_map instead of a for loop.
- All errors reading files does not prevent others from being read.
- The accounts manager needs to generate files first, with the same structure.
- Custom datadir/server argument logic moved into configuration, out of main.
- Updated the validator config directory structure, as per issue #253 suggestions
- Removed the 'generate 3 random keys' function
- Updated the README to reflect new structure
- Just exit if there are no keys, don't generate any (this is for accounts_manager, in a separate commit).
- Created a lib.rs file, so that the validator client configuration can be included by external crates.
