Add cursor.close for Python and Ruby
Omit empty parentheses in Ruby for cursor.close in Ruby
adding documentation for r.and_/r.or_ in python, and r.and/r.or in ruby
fixing references to r.and and r.or
Add CentOS + update back up
Merge master in michel_grey_issue_1582
Update python script for r.and_ and r.not_
Merge pull request #143 from rethinkdb/michel_grey_issue_1582

Merge michel_grey_issue_1582 in v1.12.x
Add link to backup page
Unbiased comparison
Fix description of upsert
Add an example for filter with and -- Related to #66
Merge pull request #186 from rethinkdb/michel_1838_upsert

Fix description of upsert
Merge pull request #188 from rethinkdb/michel_66_filter_and

Add an example for filter with and -- Related to #66
Add an example for 'filter' with 'or'
Merge pull request #189 from rethinkdb/michel_66_filter_or

Add an example for 'filter' with 'or'
Fix signature of orderby -- Related to 183
Add space before =>
Merge pull request #190 from rethinkdb/michel_183_orderby

Fix signature of orderby -- Related to 183
Addition of a C++ driver