To support 'case-when' statement, modified REGEX for do_inserter

Now we can use this as:
- case variable when value1
  .one
- when value2
  .two
Merge pull request #427 from inq/master

To support 'case-when' statement, modified REGEX for do_inserter
add test case for case-when statements
add license to gemspec
fix #431
changes

[ci skip]
require temple 0.6.6
fix tests on rbx
update readme

[ci skip]
format gemspec

[ci skip]
v2.0.1
Merge remote-tracking branch 'upstream/master' into README_ja

Conflicts:
	README.md