switch to bootstrap 3.
remove Bootstrap2 template tags.
migrate main navbar to Bootstarap3
Force migration to Bootstrap3
MIgrate ip-calc to the Bootstrap3
x
Merge branch 'master' into bootstrap_3

Conflicts:
	intranet/ip_range/templates/ip_range/index.html
Merge branch 'master' into cwdm (for bootstrap3)

Conflicts:
	intranet/templates/base.html
bootstrap 3.1.1
add netsnmp-python dependency
make up connection table
Add some validators