added feed export support
some fixes and added tests
Merge pull request #45 from fieg/feature-feed-exports

added feed export support
force public functions in abstract
Merge pull request #47 from fieg/minor-fix-export-feedtype

force public functions in abstract
seperate dirs for export cache and generated feed
fixed tests
split export cache_dir and export output_dir
Merge pull request #48 from fieg/seperate-export-dir

separate dirs for export cache and generated feed
add defaults for export config when not set
Merge pull request #49 from fieg/fix-config

add defaults for export config when not set
Fixed localized string to number transformer feeder compatibility
Merge pull request #50 from benniekrijger/fix-localized-string-to-number-transformer

Fixed localized string to number transformer feeder compatibility
Updated source modification listener
Merge pull request #51 from benniekrijger/fix-source-modification-listener

Fixed invalid source modification dates due to type casting
Made getLastFullImportDate public
Fixed source modification listener
Merge pull request #52 from benniekrijger/fix-source-modification-listener

Fixed source modification listener