Parser: allow newlines in quoted attributes
add an embedded engine for Opal
fix test and changes
Revert "fix test and changes"

This reverts commit 6dd283ed7b96f36ec00fc5ae29d6f0c2d43e95fa.
changes
fix opal test
test for wrong line numbers in pretty mode (see #472)
test opal only with temple master for now
splat is not necessary for Regexp.union
test opal only on > 1.9
opal only with tilt master
update rails versions
exclude rails builds from travis.yml
drop jruby18 support

See #351
Monthly update JP documents

- Update README.jp.md
- Add & Localize `doc/jp/*.md`
- Fix `doc/*` links in README.jp.md