doc: add documentation for version 1.1 of the API
web: use HTTP redirect for images
Fix formating of README.md
Update README.md

In Ubuntu GCC compiling need some snmp package.
gitignore: update to ignore Debian related files
init.d: update to work with more recent versions of Twisted
collector: don't allow spaces in system name
drac: minimal support for Dell RAC
dell: support for Dell PowerConnect switches
dell: grab speed/duplex through LLDP
generic: use Q-BRIDGE-MIB for generic
foundry: add basic support for Foundry switch

No trunk support since they are not reflected in IF-MIB.  See
FOUNDRY-SN-SWITCH-GROUP-MIB::snMSTrunkPortIndex.
lldp: fix speed collection

Results were not really stored in datastore...
Fix LldpSpeedCollector to avoid crashing when the ports reported by the LLDP
and IF MIBs are not consistent.
lldp: don't try to put speed on an inexistant port
lldp: handle absent lldpRemPortIdSubtype

Closes #22.
snmp: remove unused variable
images: add an image for Juniper EX2200-48T
images: add an image for Juniper EX3300-48T
images: also provide Juniper EX*-24T images

However, since this is not possible to make a distinction just with
sysObjectID, we don't really use them.