libs/web: include limits.h to fix compilation on OS X (#531)

git-svn-id: http://svn.luci.subsignal.org/luci/trunk@9618 ab181a69-ba2e-0410-a84d-ff88ab4c47bc
applications/luci-upnp: also purge entry from lease file when deleting leases, remove mini support

git-svn-id: http://svn.luci.subsignal.org/luci/trunk@9619 ab181a69-ba2e-0410-a84d-ff88ab4c47bc