bump to ruby 2

because the future
Add mysql2 gem
dump all databases from localhost
use a proper local tempfile, and upload to hostname/database/date.sql.bz2
Dump tables in a transaction

to avoid table locking problems with system tables
Merge branch 'refs/heads/master' into feature-backup-all-databases

Conflicts:
	README.md
	env.example
	lib/hoppler.rb
remove mention of HOPPLER_BACKUP from readme
Only remove files from this hostname
Merge pull request #2 from theodi/feature-backup-all-databases

Backup all local databases