Change project page in README to Github page
HACKING: Add list of dependencies for GUI
HACKING: Add notes on coding style and making pull requests
Fix #41: Do not jump to 0 % or 100 % when changing direction of transition

Signed-off-by: Mattias Andrée <maandree@operamail.com>
man: Change example to use randr to nudge new users towards that method
Add support for custom transition start and end elevation

Implemented through config options transition-high and transition-low (there
is no command line switch at this point). Determines at what solar elevation
Redshift will change from night to transition period to day.

Signed-off-by: Mattias Andrée <maandree@operamail.com>
Update po files from source