Ability to exclude tables for migration

Useful when database contains tables which does not have corresponding
schema or vice versa. This tables can be ignored by adding to
config/propel.ini something like this (patterns supported):
propel.migration.excludes = session, social_*
Fixes many-to-many joins in auto-generated filter forms
Merge pull request #206 from 19Gerhard85/master

Fixes many-to-many joins in auto-generated filter forms
Merge pull request #202 from javer/patch-migration-excludes

Ability to exclude tables for migration
PHP 5.5 support

Fixed preg_replace calls with /e modifier.
Merge pull request #212 from javer/patch-php55

PHP 5.5 support
Merge remote-tracking branch 'upstream/master'