cmd/geth: reinstate dropped --cache flag

These accessors were introduced by light client changes, but
the only method that is actually used is GetNumberU64. This
commit replaces all uses of .GetNumberU64 with .Number.Uint64.

archiveUpload did not handle absolute paths correctly. Fix it by using
the basename and ensure that uploads can be tested using -n.

This commit adds support for creating Windows installers to ci.go

internal/build: call correct signer method

build: fix missing .exe executable names on cross builds

console, vendor: update liner and enable multiline mode

appveyor: build 386 too, upload both to the gethstore

solves #3119

Signed-off-by: VoR0220 <rj@erisindustries.com>

* travis.yml: don't create darwin/386 builds

* build: remove godep remains

* internal/build: improve archives

- enable compression for zip files
- don't write half-complete archives

* build: add -unstable to archive names

travis, build: implement uploading archives to azure

common/math: go fmt