Add Ruby dependency information via Gemfiles.

Add Gemfile and Gemfile.lock, both of which are used by Bundler (a
Ruby gem) to encode Ruby dependencies for projects.

- Gemfile.lock is machine-generated (but human-readable) and encodes
  the most specific Ruby dependency information.
- Gemfile is human-written, and typically encodes less specific Ruby
  dependency information. It is used by Bundler if Gemfile.lock does
  not exist. Rubyists recommend committing both files.
Removing `.htaccess` rewrite rule that sent requests for badges' sub-pages back to `badges/index.html`.  This should close #381.
The open scoop challenge
Remove duplicate bootcamp information

For some reason some bootcamps have been duplicate in
`config/bootcamps_saved.yml`.

This commit remove all duplicate bootcamps.

~~~
$ grep slug config/bootcamps_saved.yml | wc -l
136
$ grep slug config/bootcamps_saved.yml | sort | uniq | wc -l
136
~~~
1. Integrated @r-gaia-cs's fix for duplicated bootcamp URLs.
2. Adding script to check for reoccurence.
3. Renaming Makefile targets: `make site` now builds locally for checking (as it does with `bc`), and `make check` checks validity of metadata.
Merge pull request #391 from gvwilson/remove-dup

Remove dup
Adding missing instructors to bootcamp info
Merge pull request #392 from gvwilson/fixing-saved-bootcamp-info

Adding missing instructors to bootcamp info
Merge pull request #382 from gvwilson/removing-badge-rewrite-rule

Removing `.htaccess` rewrite rule for badges pages
Merge pull request #387 from gvwilson/blog-scoop-challenge

Blog post challenging people to give examples of being scooped when doing open science.
Fixing dates on blog post
Fixing typo
Adding bootcamp at Vanderbilt to upcoming
Merge pull request #393 from amyrbrown/addVU

Adding bootcamp at Vanderbilt to upcoming
Summarizing this week's lab meeting
CBC interview
Adding Melbourne bootcamp
Adding another bootcamp
Merge pull request #397 from gvwilson/blog-cbc-spark

Blog post about Greg Wilson being interviewed on CBC Radio
Merge pull request #325 from goxberry/add-gemfile

Add Ruby dependency information via Gemfiles.