Issue golangci#205: support go modules

Fix golangci#206: build golangci-lint on go1.11

Close golangci#196: disable GAS (gosec) by default

Fix golangci#126: fix working with symlinks

disable go1.11 in travis and make some small fixes for go1.11

Fix golangci#148: fix false-positive from unused if cgo is used

Resolve golangci#146: prealloc linter support

Fix file leak in lll

Fix golangci#96: support lll

Fix golangci#109, golangci#116, golangci#131: don't report in deadcod…

…e about unused test functions in main package