Release 0.11.1
Add `export` section to usage

Adding `export` is allowed at the front of each line, this lets you
create a file that can be sourced by bash. This should be in the README.
Merge pull request #116 from oestrich/master

Add `export` section to usage
Watch .env for changes with Spring in Rails 4
use rbx-2 to fix travis issue
Merge pull request #118 from bkeepers/spring

Watch .env for changes with Spring in Rails 4
Merge pull request #119 from bkeepers/rbx-2

use rbx-2 to fix travis issue
File.exists? is now deprecated in Ruby, use File.exist? instead

https://github.com/ruby/ruby/blob/trunk/file.c#L1462
Merge pull request #121 from rsempe/master

File.exists? is now deprecated in Ruby, use File.exist? instead
Use Rails root
Merge pull request #122 from dtaniwaki/use-rails-root

Use Rails root
Don't do substitutions if the variable is single quoted.
Merge pull request #124 from ericroberts/single-quoted-variables

Don't do substitutions if the variable is single quoted.
Call the right method in the spec

closes #129
Don't encourage use of yaml syntax
docs
Use comment instead of "protected" to denote internal method
Avoid using #inject

I did not use #each_with_object, as the Rogues recommend, for two reasons:

1. I find it just as confusing as #inject.
2. Dotenv still technically supports Ruby 1.8
Doc what is returned from Dotenv.with
Link to Ruby Rogues code reading