objects to any on typing's return + dtslint fix + general test fixes

[joshstevens19]

Description

Return properties should never be a object they should be any if we can not write generic types for it. If it returns a object we get issues like this:

const test = web3.something.which.returns.object();
test.hey // wont compile 

This PR fixes this and should be the general rule for any return types that we can not write a interface for. Obviously we should be trying to write a interface for everything but there are conditions where you have to use any. Fixed this throughout. Even if the types are not in the public API this is what we should follow.

This PR will also fix some bad test typings + dstlint.

dtslint has been rolled back to a fix version of 0.4.2 and as Microsoft have now exposed definitelytyped-header-parser as a npm page i have brought that into our dev dependencies which allows it to work on node 8 + node 9 + node 10 + node 11:10 builds on Travis. This is now all working as expected and should be merged into master ASAP to avoid merge conflicts of package-locks.json files and to fix master build. 👍

Type of change

• Bug fix
• New feature
• Breaking change
• Enhancement

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no warnings.
• I have updated or added types for all modules I've changed
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run test in the root folder with success and extended the tests if necessary.
• I ran npm run build in the root folder and tested it in the browser and with node.
• I ran npm run dtslint in the root folder and tested that all my types are correct
• I have tested my code on an ethereum test network.

[coveralls]

Coverage decreased (-0.01%) to 98.494% when pulling 6d5473f on joshstevens19:@types/objects-to-any-return-types into cd32de2 on ethereum:1.0.

[coveralls]

Coverage decreased (-0.01%) to 98.494% when pulling f15fb64 on joshstevens19:@types/objects-to-any-return-types into cd32de2 on ethereum:1.0.