Closes #418

It will be available on Ruby >= 1.9

- Increase timeouts to 3 seconds
- Implement waiting for completion in a way that it detects when pane
  contents have changed instead of waiting for a fixed amount every time.

Hopefully fixes failures such as:
- https://travis-ci.org/github/hub/jobs/14369618
- https://travis-ci.org/github/hub/jobs/14369403

Allow to merge with --ff-only option

Run shell completion tests on Travis CI

Attempt to fix https://travis-ci.org/github/hub/jobs/13973842

Attempt to fix https://travis-ci.org/github/hub/jobs/13973437

Fixes https://travis-ci.org/github/hub/jobs/13920941

On different systems, bash/zsh completion scripts for git are installed
in various places. Account for that by searching the list of known paths.

In zsh mode, if a git-distributed zsh completion script can't be found
(e.g. on Ubuntu), ignore that and let it fall back to zsh-distributed
completion script.

Makes these tests work when executed outside of tmux as well.

Adds tmux 1.6 compatibility. The tests should now work with tmux 1.6-1.9

Otherwise it hits deprecation warnings because it accesses the
Minitest::Unit module.

In Ruby 2.0, `test/unit` activates a fancy output style for terminals
that doesn't look well in Travis logs. I could disable it with the
`--jobs-status=normal` test optiont, but that option isn't supported in
Ruby 1.8.7.

Instead of dealing with inconsistencies between test support in
different Ruby versions, I'm simply switching to a fixed version of
Minitest.

This silences passing notifications for new branches

Fixes #430

References ba237b6b

Previus version was written for bash v4 and was causing syntax error
when used with older versions of bash that still ship with most systems.

References 3565094d
Closes #359

Fixes #422, closes #423

Signed-off-by: NTimothy Gu <timothygu99@gmail.com>

Alias `pull-request` with `e-note`

Closes #411

Don't suggest standalone install via curl anymore because:

- hub may not be a single script in the near future
- `rake install` handles the Windows executable as well

Enable to create a new OAuth token even when user enabled two factor
authentication.

References #399

references #407

references #407

fixes #399

http://developer.github.com/v3/auth/#working-with-two-factor-authentication

Alias for `pull-request` so it can be used interchangably to satisfy
Fox™ Business'
[explanation of GitHub](https://pbs.twimg.com/media/BT_5S-TCcAA-EF2.jpg:large)

This is usually "master" but for e.g. git-flow projects it's "develop".
GitHub has an API field for the default branch but I avoided having to
hit the API and instead read from the "head" of the origin remote.

  git rev-parse --symbolic-full-name origin
  #=> refs/remotes/origin/develop

The "head" of the remote seems to be set at clone time by default, and
can be manually set with:

  git remote set-head origin develop

The pull-request command now detects this and sets the default branch as
the pull request base instead of always assuming "master" at origin.

Fixes #154, closes #326