Allow user to choose which linters are run

[alexedwards]

There are a couple of 'slow' linters that I'd ideally like the SublimeLinter-contrib-gometalinter plugin to run, especially varcheck.

Given that gometalinter supports enabling/disabling of individual linters, could SublimeLinter-contrib-gometalinter be extended to allow a custom configuration of linters via a SublimeText settings file? Something like:

{
  "linters": [
    "go vet",
    "golint",
    "varcheck",
    "errcheck",
    ...
  ]
}