Support ct_run using short name

- compatible with rebar 2.0.0

Only regenerate edocs if a source file is newer than

add crypto, syntax_tools and tools to applications key as dependencies

always be generated

overview-summary.html

version info

Not every system under test can be run with long names, and this makes
rebar's common_test support useless in those environments, as it
currently uses long names (test@hostname.domain) by default, without
recourse to change them.

This patch adds support for a {ct_use_short_names, boolean()} config
variable, which allows the user to specify whether short or long names
are required.

Newly added syntax:

{deps, [ {<depname>, ".*", {rsync, "<rsync_url>"}}, ... ]}

Where rsync_url is any URL accepted by the rsync command.

* Typos and other minor bug fixes
* Add "attach" command (via -remsh)
* Add "upgrade" command to install a hot upgrade package
* Add "upgrade" subcommand to UNIX runner script as well

{port_specs, [{".*", "priv/foo.so", ["c_src/foo.c"], [{env, []}]}]}.