Fix for issue #62 (battery monitor on olpc hardware)
news and readme updates
whitespace
cabal file tweak
NEWS: release date added
Documentation tweaks
Stricter dependency version constraints
gitignoring cabal-dev
version bump
Documentation fix
Batt improvements: watts display fix and no -c needed

We no longer use -c to specify cases when only _design exists, but try
to detect that automatically (as well as the energy/charge dichotomy).

Also fixed a bug that precluded display of <watts> when no threshold
colours were specified.
Doc updates regarding Batt changes
Battery: correct computation of watts
New -d (decimal digits) monitor option (issue #58)
Better vertical alignment (stab at #56)
MPRIS plugin
added description of mpris plugin
added links to README
switched to mtime
README note