Make test on windows green.

expand plugins for profile after applying profiles

add an (almost) unique reference to message sent from the ct provider

Conflicts:
	src/rebar_prv_common_test.erl

to itself so a selective receive can be used to retrieve it

fixes #547

add relup to readme and shell completitions

Upgrade relx and add relup provider

Conflicts:
	src/rebar_file_utils.erl

Test required `touch` utility to present on user's machine. Remove this dependency.

Seed random with erlang:now() because os:timestamp precision is not enough
on windows.

Test required `touch` utility to present on user's machine. Remove this dependency.

Seed random with erlang:now() because os:timestamp precision is not enough
on windows.

error message when no plugin is passed to plugins upgrade and global upgrade

More tests

The test works by using a parse transform that stamps modules with an
attribute as it runs them. It then compiles everything, loads the
module, and makes sure the stamps respect the defined order.

install_plugins in rebar_prv_as:do

error message for bad profile config, fixes #539

fix for overrides in plugins, simpler plugin state handling

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