Try to load org before checking `org-agenda-files'

Merge pull request #2 from Wilfred/master

Docs improvements and minibuffer prompt change

Improve `cbm-find-org-agenda-file'

- Switch automatically to a file, if it is the only possible
  candidate.
- Throw an error, if there is no candidate

Get all `org-agenda-files'

Silence byte-compiler

Add `cbm-rcirc-switch-to-channel'

Merge pull request #1 from syohex/byte-compile-warning

Suppress byte-compile warning

v0.2

- Add commands `cbm-switch-buffer' and `cbm-find-org-agenda-file'