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rmips: mips32 assembly emulator

This is alpha, but you can check it out if you are brave. Download:

• bitstring.rb: implements a Bitstring class used to perform operations on a binary string.
• signedness.rb: implements a signedness module for converting between integers and bitstrings.
• mips.rb: Implements the mips32 core memory and registers, and assembles (but does not execute) mips32 instructions.
• mips_ops.rb: Implements mips32 instructions for execution.
• test-mips.rb: Unit tests for 'mips.rb' and 'mips_ops.rb'
• test_bit_sign.rb: Unit tests for 'bitstring.rb' and 'signedness.rb'

A quick play with bitstring.rb:

$ irb --prompt simple
>> require 'bitstring'
=> true
>> s = Bitstring.new(32)
=> b'0100000'
>> t = Bitstring.new('0100000')
=> b'0100000'
>> s + t
=> b'01000000'
>> (s + t).to_i
=> 64
>> x = Bitstring.new(-25)
=> b'100111'
>> x << 2
=> b'10011100'
>> x << 2
=> b'1001110000'
>> x << 2
=> b'100111000000'
>> x.to_i
=> -1600
>> x.halfword?
=> false
>> x.halfword!
=> true
>> x
=> b'1111100111000000'

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