fix dispatcher and validation errors in global.lua

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

* remove usage of opkg via system call for version handling
thanks to Jo-Philipp Wich #335
* remove special handling of bootstrap theme #298 #334

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

- implement new option bind_interface
- fixes problems when updating status displays (i.e. showing Software update needed)
- new links to OpenWrt wiki
- new screen to set global settings
- implements global option use_curl

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

- adaption Makefile to changed luci.mk
- description in Makefile for correct version handling
- modified handling to detect and display installed version
- new functions ipkg_ver_installed() and ipkg_ver_compare
- correct wrong spellings
- modified language template and German translation

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

- adaption to LuCI's new directory structure on github
- adaption to LuCI's new Makefile optional settings
- remove CHANGELOG from github
- directory structure cleanup
not all patches of 2.1.0-3 and before were applied to new directory
structure

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

 * Rename subdirectories to their repective OpenWrt package names
 * Make each LuCI module its own standalone package
 * Deploy a shared luci.mk which is used by each module Makefile

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>