ruby: tweak regexp to detect block
ruby: add test cases for Rails template
ruby: enhance to support expression having block argument
ruby: refactor to define '#expr_has_block()'
ruby: refactor 'BabyErubis::RailsTempalte#add_expr()'
ruby: fix 'test/run_all.rb' to import only test scripts
ruby: update 'README.md'
Merge branch 'topic_block-expr' into ruby
ruby: enhance to support '--format=rails'
ruby: tweak command-option parser
ruby: enhance to support '-R' option which is same as '--format=rails'
ruby: fix test cases
ruby: tweak help message
ruby: tweak help message
ruby: add test cases for '-R' and '--format=rails'
ruby: update 'README.md'
Merge branch 'topic_option-R' into ruby
ruby: update changelog in 'README.md'
ruby: fix gemspec file
ruby: update gemspec file to specify license