fix tilt errors
require new tilt
better html_safe tests copied from temple
fix ruby 2.0 problem
cleanup changes

[ci skip]
update travis.yml versions
update readme

[ci skip]
exclude rails 4 tests on 1.8 rubies
don't test old rails on 2.0.0
allow rails 4 failures
require temple 0.6.3
v2.0.0.pre.7
fix rescue and ensure blocks (close #374)
changes
Merge remote-tracking branch 'slim/master' into README_ja

Conflicts:
	README.md