Set ASN.1 compilation options using ERLC_ASN1_OPTS

`ERLC_ASN1_OPTS` can be used to pass compiler options when compiling
ASN.1 files. By default, Erlang.mk will leave this empty, but it can
be redefined in a Makefile.

Make asciideck a little more verbose

Add experimental HiPE support in CI

Update Copyright notices

Fix target dependencies and enable parallel again

We can now use 'make -j 32' again. All tests pass. There might
be some issues left with the areas that are not fully tested
yet (some plugins).

A few changes in behavior:

* 'make app' will also do 'make deps' unless SKIP_DEPS is set.
  You can use 'make app-build' instead to just build the application.

* 'make rel' will also do 'make app' (and therefore deps). There
  are no alternative target to keep the old behavior at this time.

Remove documented stuff from the README

Merge branch 'facorro.elvis.96.plugin.readme' of git://github.com/ina…

…ka/erlang.mk

Correctly handle RELX_OUTPUT_DIR

Change cowboy URL and version to 1.0.0

Fix package fetching

Two issues got fixed:
* The variable name for the package file got changed to PKG_FILE2
  to avoid conflicts with the PKG_FILE from previous erlang.mk versions.
* The way repositories are fetched changed to fix an issue preventing
  fetching the package file *and* the repositories on the same invokation.