Cleanups (#3742)

* Remove unused file

* Combine tx checks into single file

* Move UI components into UI

* DRY links

* Unused rollup config

* Cleanup util paths

* Revert "Move UI components into UI"

This reverts commit 3379e61246cde635c296d31322b71e63395a5cd4.

* Re-apply ~/util/tx move

* Cleanup unused styles

js/src/modals/DeployContract/ParametersStep/parametersStep.js

@@ -32,7 +32,7 @@
 import React, { Component, PropTypes } from 'react';
 
 import { Form, TypedInput } from '~/ui';
-import { parseAbiType } from '../../../util/abi';
+import { parseAbiType } from '~/util/abi';
 
 import styles from '../deployContract.css';