revert: restore plugins directory
work in progress: readding plugin system, jid_worker message queues
new file:   src/modules/shrink.erl - URL shrinking module using http://縮.jp/
modified:   priv/default.cfg.erl - Added config lines, fixed tab/space marking
Merge pull request #24 from Masterkatze/shrink-module

add shrink module
replace tabs with spaces
updated shrink module to conform to updated behaviour
add shrink module to .app file
enchaced core get_http function:
add http options and request type specification support
update modules to use new get_http command
stub shrink module
move config file to xmpp.hrl header
remove comment
merge origin/master
add stub log module
fix get_http gen_server call inside modules
add log module to app file
change ulog:info to ulog:error in tw module
Merge branch 'master' of github.com:taptap/iris
move external_interface
...again?
add LOG_DIR define