Provide a way to set a specific compiler version

[filippsen]

Summary

Consider providing a way to set, change or specify the compiler version to be used when hitting the Compile action.

Motivation

is there any way to set compiler version?
Do You support version vX.Y.Z+commit.12345678?

[filippsen]

Related: #328

[javier-tarazaga]

This seems pretty useful and needed if we want to be able to allow our users to have the flexibility they require. I would suggest if we do this, to start by actually using the dappfile.json as the reference configuration file for things (like trufle.confi/gralde.build/package.json, etc)

[adamskrodzki]

Especially since there is new version 0.5.X of Solidity which is not backward compatibile with 0.4.X

I believe at least this two need to be supported

[monkybrain]

I'd appreciate this feature very much!