Add specs for Range#include? Range#member? for 1.9+
Fix Range#include?, Range#member? for X19

Example
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    ('a'..'c').include? 'bc'

Results
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* MRI 1.8.7    #=> true
* MRI 1.9.3    #=> false
* Rubinius X18 #=> true
* Rubinius X19 #=> true  #Fix here