Add some docs
Readme update

TARIC & CHIEF capitalisation, minor language tweaks
Update tariff_synchronizer comments
update docs of base_update
Merge pull request #206 from bitzesty/documentation

Adding a bit more documentation
upgrade to rails 4

includes some amendments to specs to make them work
remove all frontend

API will be sending only JSON. Remove all frontend-related code & gems
Merge pull request #207 from bitzesty/rails-4-upgrade

Upgrade to Rails 4 & remove html views
Apply the sync at 8 & 11 pm

This is because the files are dropping in reverse order from HMRC.
Run this only later in the day to pick up both files at once and
apply them in the correct order
Merge pull request #208 from bitzesty/schedule

Apply the sync at 8 & 11 pm
sort rollbacks by `id` (desc)

so we deliver latest rollbacks first. - makes more sense
Merge pull request #209 from bitzesty/sort-rollbacks

sort rollbacks by `id` (desc)
Add license title and update copyright year