Renaming hydra.rb -> hydra6.rb

Prior to this change, the `require 'hydra'` declaration did not load the
hydra gem's lib/hydra.rb but instead loaded hydra-head/lib/hydra.rb.
Pegging to patch version of gems
Bumping version to 6.0.0.rc4
Consolidating install instructions via generator
Bumping version to 6.0.0.rc5
Removed unnecessary requires

These are already required by the hydra/head require.  Having them here does nothing extra.
Upgrade to latest active-fedora
Merge pull request #7 from projecthydra/af_6.2

Upgrade to latest active-fedora
Bump version to rc6
Adding explicit declarations of bundle gems

Addressing: https://github.com/projecthydra/hydra/issues/5
Renaming hydra.rb -> hydra6.rb

Prior to this change, the `require 'hydra'` declaration did not load the
hydra gem's lib/hydra.rb but instead loaded hydra-head/lib/hydra.rb.
Adding finalized copyright statement
Updating to most current contribution guidelines
Adding Acknowledgments and Hydra byline to README
Adding CONTRIBUTORS.md file for reference

If you have cloned a repository, it is trivial to get the list of
contributors from the repo; Without a repository clone it is
non-trivial.

The CONTRIBUTORS.md file is there as a means of easily promoting and
referencing "These are the people that have contributed to the project."

The initial CONTRIBUTORS.md was created via `./script/contributors.sh`
Merge pull request #8 from projecthydra/adding-contributors

Adding CONTRIBUTORS.md file for reference
Adding script to output a project's changelog

The changelog.sh script sends to STDOUT commit subjects and authors
since the last commit. Additional parameters are available.
Merge pull request #9 from projecthydra/adding-changelog-script

Adding script to output a project's changelog
Update README.md

fixed a typo in README
Merge pull request #10 from tomcramer/patch-1

Fixed a typo in README