Add the buildRelease script to the composer bin list.

This will make this script installable.
Allow buildRelease to be run from global installation location.

This enables composer global require packageNameHere.
Add project information (name, description, keywords, authors).
Add MIT License.
Merge pull request #5 from nubs/composer-bin

Update composer installation and allow for global installation.
Prompt the user about what type of version bump this is.

Sometimes we need to bump the minor/major versions, not patch.

The default will still be patch.
Switch to 5.4 php syntax.
Merge pull request #6 from nubs/prompt-version

Prompt the user about what type of version bump this is.
Allow the user to specify version on the command line.
Use hyphens in option/argument names.

Standard CLI usage is hyphens, not underscores.
Give access to the Version object, rather than a string version.

This version object is nicer to work with and has extra functionality.
Configure prerelease settings in github.

If the new version number is a prerelease version, set the appropriate
flag on the github release.

The prerelease status is driven here by two factors.

1. If the isStable() method returns false, it's a prerelease.  This flag
    is set based off of whether there are alpha/beta/etc flags in the
    version.
2. If the major version number is 0, it's a prerelease.  The 0.*
    versions can break compatibility and such at any time.
Change $currentVersion parameter to a Version instance.

This makes the interface a little cleaner and simpler to reason with.
Prompt for exact version with autocomplete.

Prompting for the exact version makes it easier to specify custom
version numbers to tag, including versions with build/prerelease data.

The simple behavior behind the common cases of patch/minor/major
increments are maintained [for the most part] by utilizing autocomplete
where the versions are automatically entered for the user as they type.
Handle releasing a previously unreleased repository.

Before this, errors would happen if the repository did not have a prior
release.  Now, it will successfully generate release notes.
Merge pull request #7 from nubs/more-version-stuff

Better version handling
Refactor the github client behaviors into a GithubClient wrapper.
Fix comment to reflect updated logic in _getVersion.
Error early if there were no pull requests.

We don't want this command to create empty release notes, so if there
are no pull requests, just go ahead and return early.
Merge pull request #8 from nubs/refactor

Refactor the github client behaviors into a GithubClient wrapper.