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Select git clone command by git version

The option --single-branch was introduced in git version 1.7.10 and
thus rebar3 cannot fetch git dependencies on systems where earlier
git versions are install.

This commit will select other git clone commands if an earlier git
version is detected. If the git version cannot be determined rebar3
falls back on the previous behavior and uses --single-branch.

Restrict regexp to match on files starting with '._'

Correct precedence of compile options merged from profiles.

Ensures merged compiler options end up in the correct order to maintain profile precedence.

Moves the merge functionality from rebar_opts:merge_opts/2 to a standalone function to ease extension and debugging.

Replace unprocessed ~n linebreaks

Fixes #1392

Upgrade relx, erlware_commons and cf

relx ~> 3.22.0
erlware_commons ~> 0.22.0
cf ~> 0.2.2

Add 'recursive' option

Unify different styles of missing_package error

use default region for s3 deployment

Always read REBAR_CONFIG env var when loading config

upload rebar3 escript for every merge to master to rebar3-nightly

The option {recursive,boolean()} can now be set pr directory in
'src_dirs' and 'extra_src_dirs', and on top level in the new
'erlc_compiler' option. Example config:

{erlc_compiler,[{recursive,false}]}.
{src_dirs,[{"src",[{recursive,true}]}]}.

This will cause recursive compilation within the "src" directory, but
not in any other directoires.

Allow rebar3 to edoc itself

Fix rebar3 dialyzer warnings

Some tricky changes in there but should be okay

Add exclude_apps/mods, plt_extra_mods, base_plt_mods config

Fix usage decription of 'rebar3'

* exclude_apps - never use applications for PLT/analysis
* base_plt_mods - add modules to base PLT (overrules exclude_apps)
* plt_extra_mods - add modules to PLT (overrules exclude_apps)
* exclude_mods - never use modules for PLT/analysis (overrules all)

experimental: allow test specifications to be passed via the command line

`rebar3 ct --spec foo.spec,bar.spec,baz.spec` now works

also added support for the `join_specs` flag on the command line

Prevent crashes in `rebar3 as` with no tasks

checks on hd(...) and so on could not handle empty lists