Allow true/false as valid settings for individual bits #1

[Imported from RubyForge]

Since bits are often used to record Boolean flag status, it would make sense for 'true' and 'false' to be valid settings
for individual bits.

bs = BitString.new(0, 32)
bs[1] = true

iniValues = [true, false, false, true, false, true, true, true]
bs = BitString.new(iniValues, iniValues.length)