Use `.Login` instead of `.Name` for generating a remote or branch name.

It is `headRepo.Owner.Login` that holds the unix account name of the
owner, and `headRepo.Owner.Name` is omitted from the embedded owner
information, resulting in the following failure:

```
% hub checkout https://github.com/github/hub/issues/{number}
fatal: '' is not a valid remote name
```

Avoid using "label" field when parsing PR response

To obtain the owner/fork-name combo, instead of reading it from "label"
field from the PR response simply read from `Head.Ref` and
`Head.Repo.Owner.Name` instead. This is because label is meant to be
human-readable, isn't well-documented in GitHub API docs and is unclear
when it contains two components (delimited by `:`) and when it contains
only one.

Extract logic of printing out to console

Introduce a `console` package which encapsulates logic of printing out
to console. This provides flexibility of discarding output in tests.
It also allows us to unify format of printing to console (if we want to).

This fixes #801.

`Args.InsertParam` resets index to param size if it’s out of bound

`Args.InsertParam` panics about index out of bound if the index is larger than param size. These changes reset the index to param size for such case. This is equivalent to appending new items to the end.

This fixes #812.

Only keep 2.x installation instruction since it’s released

Bump `hub` to 2.2.0

merge: do not insert "--no-ff" for "--squash"

Read title and body by taking into account Windows line endings

`bufio.Scanner` takes care of line endings difference for different OSes. See http://golang.org/pkg/bufio/#ScanLines.

This fixes #805

Better arguments processing for `init` command

Closes #793

This is because the method will be shared across the whole "commands"
package, not just this test file.

Now the optional `directory` argument to `git init` is detected by
looking for the first "word" in arguments that isn't a value for one of
`--template`, `--shared`, or `--separate-git-dir` params.

Error message typo: filed -> field

Support `hub init -g DIR`

This fixes #790.

Verified from Homebrew that this it can parse the version with this format (https://github.com/Homebrew/homebrew/blob/master/Library/Homebrew/version.rb#L259-L332). The previous URL works for `x.x.x` but not `x.x.x-rc1`.

Refine package scripts

Ending package name with `vVERSION` allows Homebrew to recognize the build version in `brew install`. See https://github.com/boxen/puppet-hub/pull/10#issuecomment-71783691

don't exit when "git rev-parse" fails

Clarify setup when already developing on Go

References #765

update mattn/go-isatty dep to support OpenBSD

so that the version number is always echoed on stdout.

Fix `hub checkout <PULLREQ-URL>` for renamed fork

Get home dir using `user.Current()` if `HOME` env var is not set

Fix package's file extensions