Add conversion aliasses

[jacogr]

e.g. currently we have u8aFromBuffer, the equivalent bufferToU8a should be made available. An alias could look like the following:

const bufferToU8a = require('../u8a/fromBuffer');

module.exports = bufferToU8a;

(buffer, number, hex, u8a, ...)

[jacogr]

Closed in #31

[polkadot-js-bot]

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