Add a Gemfile to project

[Debilski]

Having a Gemfile (α) in the root directory with a content as follows:

source :rubygems

gem "jekyll"
gem "RedCloth"

would make installation for users of bundler much easier.

# Installs all required gems into a local folder (β)
# Without --path it will try to install globally
$ bundle install --path=vendor/

# Run local version of jekyll 
$ bundle exec jekyll

In the long run this means less version conflicts and less binaries in $PATH.

(α) For build stability, Gemfile.lock could also be checked in. This will fix the version number of every gem.
(β) One might need to exclude vendor/ from Jekyll’s build system then.

[SethTisue]

this was done in 925c713