Merge pull request #156 from boltnev/master

variable name collision fixed
fill_from: warn if original file is missing
Fixed #76: schema generation whith dialect-specific fields
Show more information from py.test
Shorter output from py.test
import_string() -> importlib.import_module() (closes #158)
Informative exception when metadata is not defined in model module in multi-DB configuration (fixes #44)
Use forceescape for value attribute in templates (see issue #127)
minor
Test for replication with expression properties
Merge branch 'master' of https://github.com/SmartTeleMax/iktomi
transform_br_to_p removed; Cleaner.clean_top modified
added default value to Cleaner.forbid_on_top