Improve Docker build

Remove code unreachable using Go 1.1

* Client: fix progressbar output

891 mark command as optional for docker run

* Makefile: Add link flags in order to link statically and without debug symbols

* Auth: fix auth small issue in case you change your password on index.io

fix typo in documentation

- Documentation: fix inconsistent/outdated instructions for setting up "swapaccount"

* Documentation: use sudo for quick install script

Update AUTHORS

Conflicts:
	buildfile_test.go

Conflicts:
	commands.go

- Remote API: Fix a bug which caused 'docker logs' to fail

Conflicts:
	api.go
	builder_client.go
	commands.go

Bumped version to 0.4.3

dockerbuilder : batch apt-get install operations for speed