Added R16B01 and R16B02 to travis config.

Fix basho/rebar#388

Remove experimental flags

Document compile_only=true

Fix #205 (erlydtl:compile/3 returns warnings)

If the syntax error is in a .hrl file, then the reported error message
is not as useful because it's not clear which .erl file was being
compiled. We can fix that easily by first printing what source file was
being processed. We don't change the actual error message, so this will
still work with your editor of choice for jumping to the right line.

Before
------

Success:
Compiled src/foo.erl

Failure:
include/foo.hrl:10: syntax error [...]

After
-----

Success:
Compiled src/foo.erl

Failure:
Compiling src/foo.erl failed:
include/foo.hrl:10: syntax error [...]

Fix #187 (rename getopt and mustache)

Print a more appropriate message on 'rebar info'

generate-upgrade can now take target_dir argument

erlydtl implemented 'binary' option. Add new clause for {binary, false}.

Remove experimental flag from:
* qc compile_only=true
* eunit compile_only=true
* src/foo.app.src.script
* eunit tests=

Adapt rebar_erlydtl_compiler to handle warnings emitted by
erlydtl:compile/3.

While at it, update getopt.erl to git rev 78eda3b.

To avoid treating plugins' info/2 functions as commands, we catch calls
to 'rebar info'. Previously (4b8c81fb) we simply printed the help
string, but it's much more informative to print the following:
Command 'info' not understood or not applicable

inttest/rgen_1: double the timeout a second time

Clean up rebar.config.script

Added a library template.

bootstrap: avoid trying to run 'debug' command

rebar_dia_compiler: fix Dialyzer warnings

If you invoke 'make debug', then bootstrap executes rebar:main/1 with
the extra argument "debug" and rebar treats that as a command. There is
no such command.

Without this patch you will see the following on bootstrap:
Command 'debug' not understood or not applicable

60s still seems to be too low, as it timed out for at least the R15B01
job of the timeout patch merge:
https://travis-ci.org/rebar/rebar/builds/15051701
https://travis-ci.org/rebar/rebar/jobs/15051703

Fix log levels

inttest/rgen1: increase retest timeout (30s -> 60s)

The current default (30s) causes inttest/rgen1 to timeout too often. Add
retest.config to double the timeout.

Make list of commands (for unabbreviation) easier to maintain

It's easier to modify the list with each command on a separate line.
The shell completion scripts have already been modified that way.

Switch retest dep to upstream (dizzyd/retest.git)

Now that Dave has merged all patches, it's safe to switch back to
upstream retest.

rebar_core: fix Dialyzer warning introduced in aa46d85 (#157)

Fix false reporting of (plain) vsn strings

Add missing dep examples and fix existing ones

Fix erl_opts use

Previous generate-upgrade required renames in rel/ directory:

    rebar generate
    ...changing code...
    mv rel/<release> rel/<release_prev>
    rebar generate
    rebar generate-upgrade previous_release=<release_prev>

With the proposed changes you can now do the same without moving things:

    rebar generate # default target dir: rel/<release>
    ...changing code...
    rebar generate target_dir=<release_new>
    rebar generate-upgrade target_dir=<release_new> previous_release=<release>

Delete unused inttest/retest binary