Merge pull request #13 from avh4/fibonacci

Add fibonacci(n) for n∈[13,21)
Add list of English words implemented as js object
Merge pull request #14 from Sarith21/master

Add list of English words implemented as js object
Update README.md

Constant.js has expanded its reach and this must be reflected in the readme.
Add "why" function
Merge pull request #15 from ackrause/patch-2

Update README.md
Fix merge conflit in README file
Update description for "why" function
Merge pull request #17 from cilop/master

Add "why" function
Merge pull request #18 from avh4/fibonacci

Add fibonacci(n) for n∈[21,34)
Adds usefulRandom
Adds undefinedError
Add fibonacci(n) for n∈[34,55)