Fix test for rdebug --annotate
Add rdebug test for "debug" flag
Add documentation for port and cport
disable rdebug executable tests
WIP: refactor rdebug
Change rdebug_test name so it doesn't autorun

Only files ending with _test.rb are run by 'rake'.  Modify it so that it
runs with "ruby test/rdebug/rdebug_test_slow.rb"
Fix rdebug require statement
Refactor Rdebug: extract rdebug_option_parser

With pair programming help from @natecraft1