added a collect method for freej's linked lists in the ruby binding.
Created an example script which uses this to print out a list of the
installed filters, sorted by name.
Created a separate file for ruby redefinitions and extensions of freej
methods. removed the extensions hard coded into the ruby swig freej
library and instead load this file in that library [with error
checking]. Updated two example scripts to set paths correctly to use
this new setup [to test before installing].
Also included a .each method for Linkedlist
this is sort of a hack but it works.. it evaulates a string [which
contains ruby code] using the ruby c api, when the Freej ruby module is
loaded.
Removed this identical code from the ruby test script and cleaned up the
scripts a bit
