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Create an RLP encoding library
## Issue Type
[ ] bug report
[x] feature request
## Current Behavior
We currently differ from the Plasma MVP spec by creating a simplified `deposit` function at the cost of a more complicated `withdrawDeposit` addition. This should be removed, but requires that we be able to encode transactions on-chain.
## Suggested Fix
### Solidity RLP Encoding Library
RLP (Recursive Length Prefix) is a method for encoding arbitrarily nested arrays of binary data. You can learn more about RLP encoding [here](https://github.com/ethereum/wiki/wiki/%5BEnglish%5D-RLP).
We’re using RLP to decode transactions for our [Plasma MVP](https://github.com/omisego/plasma-mvp) implementation. However, we’re also maintaining a simplified Plasma contract (as a learning resource) that could be made even simpler with an *RLP encoding library* written in Solidity.
We’re looking for a relatively simple RLP encoding library. It doesn’t need to be hyper-optimized, but optimizations are always appreciated! You should look to the Ethereum [RLP wiki page](https://github.com/ethereum/wiki/wiki/%5BEnglish%5D-RLP) for a detailed spec of how RLP works.
RLP operates on arbitrary binary data. However, we’d like to be able to RLP encode typed objects in Solidity. Therefore, the contract should expose a few key functions:
- `encodeBytes(bytes memory self) internal pure returns (bytes)`
- `encodeAddress(address self) internal pure returns (bytes)`
- `encodeUint(uint self) internal pure returns (bytes)`
- `encodeInt(int self) internal pure returns (bytes)`
- `encodeBool(bool self) internal pure returns (bytes)`
- `encodeList(bytes memory self) internal pure returns (bytes)`
Note that `encodeList` does not need to recursively encode the contents of the list (you can assume they’re already encoded).
## Motivation for Change
We want to match the original Plasma MVP specification, and therefore need to remove `withdrawDeposit`.
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