Only print installed modules in list_modules
Merge pull request #47 from cavalier38/list_installed

Only print installed modules in list_modules
create_md5sum_log: treat files properly that contain single quotes in the filename
automatically enter $SOURCE_DIRECTORY after default_pre_build

It is annoying to manually do this cd in _every_ PRE_BUILD file
Merge pull request #48 from v4hn/default_pre_build-cd

automatically enter $SOURCE_DIRECTORY after default_pre_build
mirrors/KDE: Updated URL list taken from KDE Official mirrors list, see;

http://download.kde.org/extra/mirrors.html
Merge pull request #49 from stumbles/master

Updated mirrors list for KDE taken from their official mirrors list; http://download.kde.org/extra/mirrors.html
mirros/GNU: Updated the mirror list using http://www.gnu.org/prep/ftp.html

as the reference. Also they have a link that acts much in the same way as
Sourceforges auto-geo link (http://ftpmirror.gnu.org/).
Merge pull request #50 from stumbles/master

GNU mirror update.
Added a few .cache files to the exclude list