(in `rebar_file_utils`)

`erl_first_files`

fixes #99

from run to run

`common_test` and `eunit` providers

option handling

in presence of keys defined multiple times

compiles common test files in a temporary dir (or a user specified
dir) and runs tests without leaving artifacts in the source tree

precompile tests using `rebar.config` and disable autocompile so
project specific options are used

fixes #62

compiles apps and eunit test files in a temporary dir (or a user
specified dir) and runs tests without leaving artifacts in the
source tree

automatically defines the 'TEST' macro if not already defined and
adds `test` to `src_dirs` to allow for eunit test files outside `src`

compiled first

- Includes tests for templates and their application

Now supports arbitrary commands

Using a namespace such as 'rebar3 lfe new' will look for the 'new'
command in 'lfe' namespace without the need for a 'do' provider to be
registered in that namespace.

Manually checked that 'rebar3 as <profile> <namespace> command' works,
as well with 'default' and 'do'.

Test suite still needed.

And more general namespace support

No longer needed.