Adding an example for using Capybara/FactoryGirl to test attachments. I
ran into an issue on my project where the files I was uploading in my
test were getting saved multiple times, leading to hundreds of extra
files before I caught it. I did a bunch of research and found this to be
the most elegant solution (saving files in the testing environment to a
custom location and then deleting that directory after the suite runs).
I thought some clarification in the README would help people deal with
the more easily in the future.

Allow to pass arrays of validations to the validators

Fix intermittently failing spec

Documented devkit requirement for Windows

* Change `rbx` to `rbx-2`
* Mark `rbx-2` as allow-failure again

Fixes #1550

Remove typo in contributing guidelines

- With fixes as suggested by mike-burns

Remove extraneous 'not'.

* `fog_spec.rb:328` fails intermittently due to a race condition
* Use [TimeCop][1] gem to freeze time during the spec
* Extract magic number
* Break long line

[1]: https://github.com/travisjeffery/timecop

![TimeCop
Poster](http://www.deconstructingmovies.com/wp-content/uploads/2014/03/timecop-poster.jpg)

https://github.com/thoughtbot/paperclip/issues/1543

added :preserve_files notes to the README

Document requirement for file command.

Update Capistrano Task example for working in 3.x version

Optionally disable inspecting EXIF for orientation

Ensure required validations accepts subclasses

Add german locale file

Locale file for spanish

* Extract private methods
* Remove trailing conditionals
* Remove explicit returns
* Remove `.self`

Add docs badge to README