Add bit-ops

  Added bit-shift-right, bit-clear, bit-set, bit-flip & bit-test
Merge pull request #68 from patrickgombert/bit-ops

Add bit-ops
Allow nil to be passed to nth
Merge pull request #69 from patrickgombert/nth-of-nil

Allow nil to be passed to nth
Implement rest
Use EMPTY-LIST when returning the rest of an empty seq
Implement second
Implement number type check boolean functions

  Introduce Protocols for Integer, Decimal & Float
Merge pull request #72 from patrickgombert/number-types

Implement number type check boolean functions
Merge pull request #71 from patrickgombert/rest

Implement rest
Implement byte, short, int & long