Fixes #58 - Update Gemfile to convert git into https to avoid RSA Key issue

[oloc]

Retrying git clone 'git@github.com:puppetlabs/beaker.git' "/home/travis/.rvm/gems/ruby-1.9.3-p551/cache/bundler/git/beaker-18670cc1b84a185c2066a67869906a4430a4c4a8" --bare --no-hardlinks --quiet due to error (2/4): Bundler::Source::Git::GitCommandError Git error: command `git clone 'git@github.com:puppetlabs/beaker.git' "/home/travis/.rvm/gems/ruby-1.9.3-p551/cache/bundler/git/beaker-18670cc1b84a185c2066a67869906a4430a4c4a8" --bare --no-hardlinks --quiet` in directory /home/travis/build/elastic/puppet-logstashforwarder has failed.
Warning: Permanently added the RSA host key for IP address '192.30.252.131' to the list of known hosts.
Permission denied (publickey).
fatal: Could not read from remote repository.

This error message is due to the use of the git protocol which needs an SSH Key use.
To avoid this, we need t use the https protocol instead.

[ghost]

Jenkins standing by to test this. If you aren't a maintainer, you can ignore this comment. Someone with commit access, please review this and clear it for Jenkins to run; then say 'jenkins, test it'.

[oloc]

Should fix issue #36 .

[oloc]

Can one of the admins verify this patch?

[ghost]

Can one of the admins verify this patch?

[oloc]

Can one of the admins verify this patch?

[oloc]

Is there anybody in there? No more maintainer?