Merge pull request #26 from eregon/1-4-stable

use rb_ary_entry() and rb_ary_subseq() instead of RARRAY_PTR
merge ruby/ruby@736a429 upstream
Merge pull request #27 from zzak/merge_736a429

Merge doc change upstream
bumping version
fixing patch
define a backward compatible version of rb_ary_subseq()

* See tenderlove/racc#34