update extractors code to new specs
Merge pull request #45 from kalessin/extractors

update extractors code to new specs
add dont_filter flags in login/generic form associated requests, in
order to avoid redirections to be filtered
Merge pull request #48 from kalessin/dontfilter_forms

add dont_filter flags in login/generic form associated requests, in
Add support for 'file' type in generic_form fields
Rename field type from 'file' to 'url'
Refactor generic form field types, rename 'fixed' to 'constants', 'all' to 'iterate' and 'url' to 'inurl'. Also add support to use regex in 'iterate' and a list of fields in 'constants'
Make sure the unit tests pass
Merge pull request #46 from andresp99999/generic-form-implementation

Add support for 'file' type in generic_form fields