List all the contributors + those who have posted 5 or more issues.

rake bump

    Bumps the minor version number by one.

rake bump["6.0.0"]

    Bumps to the specified version.

The version.rb file gets updated and committed.  The commit gets tagged
with the same version number.

So it's easy to find and update in there.

Extract it from the run of jsduck --version.

A regression introduced by the previous enhancement of Basic warning
class.

Helpful for debugging purposes.

Overrides shouldn't be inherited, but the code in InheritMembers
happened to inherit them along with all the other things, causing
auto-detected members to share the same overrides array, resulting
in bogus lists of overridden members.

This fix should take care of bug #465.

These are two different things.

Instead of looking up all the matching rules and taking the last one,
maintain the rules array in reverse order and use #find to grab the
first matching rule.

Implement the basic warning type like the Nodoc warning, so we can
combine +link:/src with -link:/src/ux

Removed a special case treatment of warnings with PATH from the
implementation of +all warning.  This check only worked for the
Basic warning type but not for the All type, which throws no
exception when setting of warning has no effect.

Removed the "has no effect" exception from the Basic warning type,
as it wass just a little helper notice and not really crucial to
have.

Fixes #462

Drop the statement from JSDuck code itself.

That's more of a debugging commit to see if this helps to make our
TravisCI build pass.

Fixes #460

A simple check that running jsduck --version results in 0 exit code.

Fix typo in README.md

Placed it in the same group with @deprecated and @removed, so one
can also add a version number (since when the feature was added),
and a comment:

    @experimental 3.2 To try out new Google API.

Tweaked the styles of @deprecated and @removed too, so they all look
a bit better.  To allow for different message text in @experimental,
had to introduce @msg and @since instance variables to the DeprecatedTag
base class.

Fixes #239

Grouping the --processes, --cache and --cache dir inside it.

Refs #446

Marshal dump format can change between Ruby versions and although
the Marshal has its own version numbers, I get an encoding error
when reading the Ruby 1.8 Marshal dump with Ruby 1.9.

The parsed source code data structure can also change between
versions of JSDuck.

To eliminate these problems, a .cache/manifest.txt file is created
with the contents like:

    Ruby: 1.9.3, JSDuck: 5.2.0

The file is then checked to match the current version of Ruby and
JSDuck.  If the versions don't match, the whole cache is invalidated
(all files removed from it).

Refs #446

Take the file name also into account when calculating the MD5 hash
of a cache entry.  Otherwise files that are renamed would also be
read from cache, resulting in the old filename being referenced in
the docs and also in the warning messages.

Refs #446

We remember each cache entry that was read or written during the
current jsduck run.  All others get deleted.  This ensures the .cache
directory doesn't grow over time.

Refs #446

By default the caching is disabled.  When turned on with --cache,
the caching dir will be <output-dir>/.cache/ unless overridden
with --cache-dir option.

Previously the whole output dir got cleaned up, but now it can
contain a .cache dir, which we'll want to preserve.  So I created
OutputDir class to take care of output directory cleanup in a way
that preserves the .cache/ directory inside it.

Refs #446

Refs #450

At the moment the cache is just saved to .cache/ in current dir.

The parsed data is serialized into binary format using Marshal,
which correctly preserves all the data types and is additionally
really fast.

Refs #446

Refs #444

Only data properties can have the writable flag, accessor properties
can't.

Fixes #444

Force RKellyAdapter spec source to ASCII encoding.