rename logic --> operators
add getter factory, specs and tests
add boolean expression filter, basic test of equality
tests for additional boolean expressions
add greater than, less than
rename GetterFactory --> ExpressionFactory
move getter specs to expressions module
remove conusing "match" from property getter expressions
move getters inside expressions module
rename getter --> expression in filter
move expression tests to their own class
rename getter --> expression
implement conditional expressions + test
add constant expression type
pep8
test for constant expression
missing file
you win this round, lintbot
remove silly default value
don't 500 getting xml if _attachments is None

this can happen after copy_domain