Reduce coverage for a faster build

Don't test Ruby 2.0.0 and Rails 4.0.x via CI
Merge branch 'master' into ruby_test

Conflicts:
	.travis.yml
use `Money::new` in documentation
bump version 0.7.0 -> 0.8.0
Merge pull request #67 from envato/ruby_test

Reduce coverage for a faster build
Merge branch 'master' into balance_bug_fix