Filter::Regexp now works on each entry as intended

Encode::decode overwrites the source string when FB_CROAK is used as the
CHECK flag.  This sets the 'regex' config value to an empty string after
processing the first entry, which means the regex never runs on
subsequent entries.  Adding LEAVE_SRC to the CHECK flag ensures the
plugin's config data isn't touched.
some sanity check to prevent plagger dying on aggregation.

The feed http://dustdrops.blogspot.com/feeds/posts/default makes plagger die
due to the fact that $media becomes non-HASHref as assumed in the code.
added Module::Install::TestBase
Merge pull request #10 from hisaichi5518/add-module-install-testbase

added Module::Install::TestBase
Merge pull request #8 from tsibley/filter-regexp-multiple-entries

Filter::Regexp now works on each entry as intended
Merge pull request #9 from gugod/master

Some sanity checks to prevent dying on aggregation.