add integration with SimpleForm's `input_field`

closes #102
do not try to set default value for not selected attributes
Merge pull request #103 from brainspec/issue-101

do not try to set default value for not selected attributes
Update CHANGELOG.md
Fix RSpec matcher description
Merge pull request #104 from andreygerasimchuk/rspec-description-fix

Fix RSpec matcher description
add spec for rspec matcher description
update CHANGELOG [ci skip]
update CHANGELOG [ci skip]
Update README.md
return proper RSpec failure message

for enumerized attribute with default value. Closes #108
use custom column coder

Fix uniqueness validation with Active Record
update rails 4 gemfile
Merge pull request #112 from brainspec/validate-uniqueness

Fix uniqueness validation with Active Record
Support multiple attributes in Active Record #becomes method
tests are passing on jruby now
patch uniquness validator instead of using serialize

refs: #111, #117
add failing test for loading a value in mongoid with multiple: true
fix reading attribute with multiple: true in mongoid
change conditions order