Added .second and .third functions

Added non wrapper functions second and third which will grab the second and third elements in an array.
Added second and third wrapper functions for chain

Added second and third wrapper functions for chaining
Updated readme for second and third methods.
Added implemented second through tenth functions

Added both wrapper and class second through tenth functions.
Added nth function tests

Added nth function tests
Refactored logic for nth functions
Update README.md
Merge pull request #55 from TheLarkInn/feature/nth_methods

Feature/nth methods