Test with Ruby 2.1.0 on Travis CI
Merge pull request #191 from AlekSi/patch-2

Test with Ruby 2.1.0 on Travis CI
Build matrix
Fix tests for Rails 3.0
Merge pull request #192 from iNecas/build-matrix

Build matrix
we are already in Apipie::Validator
add nested validator
add unit tests
update Readme
fix for process_value
use Array instead of nested
arity == 0 to check there is no argument