Stop using class_eval on an Object

* it's provided by activesupport, with a small change we can just use
  plain ruby
switch from Object#blank? to plain ruby

* it's provided by activesupport, with a small change we can just use
  plain ruby
Kernel#Array() is very similar to Array#wrap()

* it's provided by activesupport, with a small change we can just use
  plain ruby
stop using String#squish

* it's provided by activesupport, with a small change we can just use
  plain ruby
avoid String#starts_with?

* it's provided by activesupport, with a small change we can just use
  plain ruby
Merge pull request #470 from yob/remove-internal-activesupport-calls

Remove internal activesupport calls