Updated README to list the current credentials.

Also added notes about the presence of alternate configs - and
warned novice users away from them for now.
Merge branch 'master' of https://github.com/rohe/pysaml2
Various tweaks to example documentation & helpers.

Fixed the "starting" URL referenced in README - /whoami does not
exist any more, so following the instructions gave a "Not Found"
error.

Re-ordered the README sections to put things needed most often or
by more users up front; moved things most people will not need to
know towards the end.  (Very little content is new/changed; most
is just rearranged.)

Updated create_key.sh to be more test-friendly, and document how
to deploy newly generated keys; added a pointer to it in README.
Fix path checks in some tests.

When running ./setup.py test, these two tests were failing to find the
.pem files located in the tests/ directory that they were referencing
without paths.

Other tests use full_path from pathutils to reference files in tests/,
so adjusted these to do similarly, and now they pass.
Update example HTTPS cert & key filenames.

pki/my{cert,key}.pem are used for request payloads; set those as
the defaults for HTTPS as well.  Note that HTTPS isn't necessarily
in a working state - this just gets us a bit closer.
Merge pull request #106 from hlein/master

Updated README to list the current credentials.