Unable to remove all namespaces

[mingfang]

I'm using this parser to parse a SAML AuthResponse am unable to remove all the namespaces.
Here is a short script to demonstrate the problem.

local xml = require("xml")

local data = xml.load [[
<samlp:Response ID='_cefdb557d60e0ba08b37' IssueInstant='2015-09-02T05:45:46Z' Destination='http://rebelsoft.com:81/saml/acs' xmlns:samlp='urn:oasis:names:tc:SAML:2.0:protocol' Version='2.0'>
  <saml:Issuer xmlns:saml='urn:oasis:names:tc:SAML:2.0:assertion'>http://rebelsoft.com:81</saml:Issuer>
</samlp:Response>
]]

xml.removeNamespace(data, 'urn:oasis:names:tc:SAML:2.0:protocol')
xml.removeNamespace(data, 'urn:oasis:names:tc:SAML:2.0:assertion')

print(xml.dump(data))

In this demo, the first removeNamespace() works, but not the second one.

[mingfang]

I think the problem is in https://github.com/lubyk/xml/blob/master/xml/init.lua
After line 237 we need this

if type(v) == "table" then
   lib.removeNamespace(v, key)
end 

[gaspard]

@mingfang Could you create a test and a pull request ?