Implementing Merkel and Patricia Tree in Node.js

Node.js implementation of Merkel tree and Patricia Tree used in Ethereum blockchain

MerkelTree

This class has the following methods:

1. createTree(transactionList)

   Adds layers to the tree for the passed transaction list

2. verify(transaction)

   Checks if the transaction is valid or not

PatriciaTrie

This class has the following methods:

1. add(transaction)

   Add transaction to the trie

2. get(hash)

   Get transaction from the trie for the passed trie

3. remove(hash)

   Remove the trnasaction with the hash if found