Adds loginFailureTracker helper
Adds redis config for dev
Adds default config for loginFailureTracker and adds sleepTime
Hookup login failure tracker to /wallets/show
Adds some design explanatory text
Remove todo
Delint
Adds test redis config
Remove deprecations
Fixes test run by activating stex
Adds redis clearing and tests for login failure tracker
Reduce lockout time
Fixes comments
Merge pull request #8 from stellar/deter-online-dictionary-attacks

Deter online dictionary attacks - Round 2 (now with a test!)