add package freifunk-berlin-freifunk-defaults

default settings for /etc/config/freifunk
add freifunk-berlin-dhcp-defaults package
Merge pull request #17 from freifunk-berlin/feature/freifunk_defaults

add package freifunk-berlin-freifunk-defaults
ffwizard-berlin: fix calchwmode to return correct results

The old code just looked into default configs in wireless and therefor ignored
for example 802.11n support (it's not set in the default config).
uci.sys.iwinfo() seems broken that is the reason why we have to get the
parameters from iwinfo directly.
Merge pull request #16 from freifunk-berlin/feature/package_dhcp_defaults

add freifunk-berlin-dhcp-defaults package
ffwizard-berlin: refactor iwinfo code
ffwizard-berlin: add empty table as fallback
ffwizard-berlin: fix syntax and community name in freifunk-berlin-freifunk-defaults
ffizward-berlin: remove obsolete parameters

mcast_rate and country should be set in community_profiles or via default
packages.