Adding Fixnum#[] (bits as element references)

http://www.ruby-doc.org/core-1.9.3/Fixnum.html#method-i-5B-5D
resolves #501 Change char to ch to avoid keyword conflict
Merge pull request #502 from mojavelinux/issue-501

resolves #501 Change char to ch to avoid keyword conflict
Fixing array expansion when triggered by attribution indexed by range
Merge pull request #504 from chesterbr/array_resize_with_range

Fixing array expansion when triggered by attribution indexed by range