Add reproducible workflow lesson
python/reproducible_workflow.md: Remove trailing whitespace
lessons/misc-reproducibility: Use new bc directory structure
lessons/misc-biopython/reproducible_workflow.md: Remove history-less content
Merge branch 'jkitzes-reproducible' into jkitzes_credit
updated lessons index with @jkitzes credit
Merge remote-tracking branch 'ahmadia/jkitzes_credit'

* amhadia/jkitzes_credit:
  updated lessons index with @jkitzes credit
  lessons/misc-biopython/reproducible_workflow.md: Remove history-less content
  lessons/misc-reproducibility: Use new bc directory structure
  python/reproducible_workflow.md: Remove trailing whitespace
  Add reproducible workflow lesson
Converting to triple-tildes in Markdown source files
Fixing formatting glitch in one Markdown file
Switching to triple-tilde in Markdown code blocks in IPython Notebooks
Merge pull request #205 from ethanwhite/typo-fix

Fix typos in novice Python lessons
Merge pull request #212 from gvwilson/use-triple-tilde-for-code-blocks

Use triple tilde for code blocks
Typo fix: "on" -> "one".
Merge pull request #213 from goxberry/rules-typo

Typo fix: "on" -> "one".
Move style information to begin of lesson

In the Git lesson some black lines was add to  make the commands
more easy to read. This information is now in the begin of the
lesson.
Merge pull request #215 from r-gaia-cs/git-style

Move Git lesson's style information
Fix typo in image source
Fix typo of Markdown syntax
Adding contributing guidelines.

Includes license, workflow, and file formats sections.
Updating contributions description