recognize IE11 as MSIE, fix #460

* http://blogs.msdn.com/b/ieinternals/archive/2013/09/21/internet-explorer-11-user-agent-string-ua-string-sniffing-compatibility-with-gecko-webkit.aspx
* http://msdn.microsoft.com/en-us/library/ie/ms537503(v=vs.85).aspx#UATokenRef
Remove duplicate test in testsuite.utils for test_import_string.
fix issue #492
Fix IterIO
Run tests with Python 3.4 using tox
Fix #502

The code so far made far too many assumptions about the format used by
pickle, the changes introduced by PEP 3154 finally caused this to become
a real issue. This changes the code to make no assumptions about the
representation whatsoever, making it work with protocol 4, all future
protocols.
Merge pull request #500 from r3m0t/patch-1

Fix IterO.readline
Merge pull request #493 from LightTao/master

fix issue #492
Merge pull request #483 from tony/import_string_dupe_test

Remove duplicate test for utils.import_string.
Merge pull request #473 from posativ/fix/460

recognize IE11 as MSIE, fix #460
Merge branch 'master' of https://github.com/mitsuhiko/werkzeug into patch-1