* manage-credentials:
- Save credentials to ~/.cache/lp_credentials/ by
default.
- Set service option default to edge.
* doc/manage-credentials.1: Update as necessary for the above.
* common.py:
- When credentials are not found, ask user to see
manage-credentials manpage.
- Load all token files for the consumer specified in the above
directory as necessary.
* common.py: Change default location of our credentials to
~/.lp_credentials.txt and service to edge.
* requestsync.1: Change as necessary to launchpadlib.
