makefile minor fix
escript mode fixes and improvements...

- refactor 'meta' dir to 'cache' dir;
- remove extra cfg options for 'www' dir and 'priv' dir;
- escript mode fix: start epmd automatically;
- add some comments;
- cover with specs;
- introduce _priv module - interface to 'priv' filesystem.
extend gitignore
lang: remove unused data
more intelligent operations with media files...

- update thumbs and resized images when modification time
 of origin media file is changed;
- use erlang:open_port/2 instead of os:cmd/1 for forking
 external commands.
logging to file
reorganize example configs and templates
escript: usage memo minor improvement
remove obsolete helper script
makefile: remove log files
autoreopen log file each minute
prepare initd script and config for Debian
escript: do not start the Erlang Distribution by default.
remove obsolete Erlang applications config file template
debian-install: do not create special user home directory