Update CF environment variables link for ruby

[#73153838]
Update CF environment variables link for node.js

[#73153838]
Added links to Python, PHP, and Go source

* http://docs.cloudfoundry.org/buildpacks/

[#73153838]
Migrate page describing offline modes

[#73155900]
Migrate merging info from github.io to cf docs

[#73156178]
Migrate implementation docs from github.io

[#73155340]
Add links to github issues

[#73153838]
Merge pull request #5 from cf-buildpacks/offline-mode-detail

Improve offline mode descriptions
Merge pull request #6 from cf-buildpacks/merge-strategy

Document merge strategy
Merge pull request #7 from cf-buildpacks/on-premises

On premises documentation
reformat system buildpacks information as a table
edit system buildpacks topic
Edit to correct broken links
edit to table intro
erge branch 'landing-page-links' of github.com:cf-buildpacks/docs-buildpacks into cf-buildpacks-landing-page-links

Conflicts:
	index.html.md.erb
	node/node-environment.html.md
	ruby/ruby-environment.html.md
Merge branch 'cf-buildpacks-landing-page-links'
Correcting link to bookbinder
add section for logging considerations with Rails 2/3/4
edit index.html with Rails 2.x
edit index.html with Rails 3.x & 4.x