Fixed bug with "logon -t" option.

_setProxyCertLifetime() could deal with str or int values but script.py
converted the argument into a float.
 * Added the ability to set a credential name.  This is a simple extension to the username and is concatenated with it when passed over the MyProxy protocol in the USERNAME field.  Logon will now fully support authenticate based on a certificate and key used with SSL.  In this case no pass-phrase is required.
 * Also switched proxy lifetime property to accept a float input as well as int or string type.
Progress on security proxy middleware for MMD.
Progress on security proxy middleware for MMD:
 * Now correctly performs authentication with redirects.  Needs tidying up.
Progress on security proxy middleware for MMD:
 * tidying up code.
Progress on security proxy middleware for MMD:
 * refactored and added FileObjResponseIterator to return WSGI response in blocks rather than trying to read the whole response in one go.
Fix for ticket:1130 and related bug
In ndg.xacml.core.target.Target._matchChild, all SubjectMatches within a Subject must evaluate to true for an overall match for the Subject (and similarly for Resource, Action and Environment).
In ndg.xacml.core.match.MatchBase, matching of the attribute value for a SubjectMatch with any of the values for the selected attribute of the Subject should result in an overall match (and similarly for Resource, Action and Environment).
Added an implementation of the first-applicable rule combining algorithm.
Include policy file for test CA
== 1.3.0 Release ==
See setup.py for changes in this release.  Fixes in this final revision:
 * Reworked unit tests for better organisation of trust roots generation and disposal.
 * Updated unit test credentials
Remove dependency on local ez_setup - re-release as 1.3.0
Tidied up Decision type class vars
Should fix ticket:1131
Cache compiled regular expressions used by regexp-match functions to avoid recompilation.
Updated error handling
Include unit test for PyOpenSSL urllib2 extension.
Added first version of urllib2pyopenssl.
Added first version of ndg_oauth.
Added comments.
Additional headers and comments.