for `read_between_lines` function commands.rb. Removed before/after
hook output text (too spammy). Fixed file-mode completion, so it works
straight away. CHanged 'pry' rake task to 'binding.pry' instead of
just 'pry' so that context is given.
* added :__script__ test to hooks too
* raise was due to top-level rubinius __method__ returning :__script__
and not simply returning nil (like MRI/JRUBY)
* Fix was to include :__script__ in the test.
* also slightly improved working in README.markdown
* Commands now completely manages 'help', so that 'help' returns full command list/doco and 'help cmd' returns doc for just that command
* Turned out.session_start() and out.session_end() into hook methods: Pry.hooks :before_session, and :after_session
* Refactored Pry#initialize, so no longer individually setting accessors and hash options, instead using ConfigOptions to iterate over accessors and set their default value to Pry.send(accessor_name)
* TO DO: rewrite tests in terms of new program structure, since they're all failing due to major change (not because functionality is lacking but due to assumptions tests were making about program structure)
