Todo list:
- Add mouse over popups
- Find out why only the default calendar won't respond to double clicks
- Get the checkboxes on the popup menu working
- Add drag & drop to events to move them along the timeline

Version 0.5
- Version - Bumped version to 0.5
- Version - Bumped Thunderbird max version to 24.*
- UI - Fixed bug where the red Now line failed to show in Thunderbird 24
- UI - Changed -moz-border-radius to border-radius in css

Version 0.4.1
- Version - Bumped version to 0.4.1
- Version - Bumped Thunderbird max version to 8.*
- UI - Fixed bug where timeline always showed the time as GMT rather than the local timezone

Version 0.4
- Version - Bumped version to 0.4
- Version - Bumped Thunderbird max version to 7.*
- Version - Removed Sunbird compatibility (Sunbird was based on Thunderbird 2. Changes since then mean that this version won't work with it)
- UI - Now Line shows above events again
- UI - Timeline no longer deforms as events roll into view
- UI - Week and month view now show events correctly
- Javascript - Wrapped everything into a nice tidy class

Version 0.3.4
- Version - Bumped version to 0.3.4
- Version - Bumped Thunderbird min version and max version to 5.*
- UI - Updated UI to work with Thunderbird 5 (with several regressions)
- Regression - Now Line is now underneath events rather than on top of them
- Regression - All Day events now show as the same height as regular events instead on a line
- Regression - Timeline deforms slightly as an event rolls onto the screen, leaving events slightly out of sync (by less than 10 mins)
- Regression - Event doesn't start rolling ont the screen until 25px after it's start time, then appears as an expanding box.

Version 0.3.3
- Version - Bumped version to 0.3.3 for reupload to Mozilla for review

Version 0.3.2
- Version - Bumped version to 0.3.2
- Version - Altered chrome manifest & related files to change 'timeline' to 'calendartimeline' to remove conflict with Message Timeline add-on.

Version 0.3.1
- Version - Bumped version to 0.3.1
- Version - Bumped Thunderbird to 3.1a1pre
- Version - Removed dependency on Lightning being installed to allow version updating to be done at AMO without needing a new release

Version 0.3

- UI - Added scroll wheel support to zoom in & out the timeline
- UI - Added a "Reset Zoom" option (doesn't take place until next reload)
- UI - Scroll smoothness much improved
- UI - Added an icon for repeating events
- UI - Added an icon for events with alarms
- UI - Added week & month views

Version 0.2

- Version - Bumped version to 0.2
- UI - Changed display for All-day events to be a couple of pixels at the bottom of the timeline
- UI - Event name is now displayed after start of event has scrolled offscreen
- UI - Fixed timeline so that it goes across the entire screen width rather than just 1280px
- UI - Set event title colours to depend on event backgrounds over whether to be black or white
- UI - Set event backgrounds on non-coloured calendars to match that of normal calendar views
- UI - Altered font size & style to standard
- UI - Added functionality to hide or show events, all day events or tasks
- UI - Only show events from selected calendars (same as in calendar views)
- UI - Display occurrences as well as events
- UI - Fixed all day events to take account of timezone

Version 0.1

- Version - Set version to 0.1
- Version - Set compatibility to Sunbird/Lightning 1.0pre - 1.0pre
- Version - Set Thunderbird compatibility to 3.0b1 - 3.0b3pre
- UI - Created a timeline above the status bar extending several hours into the past and future
- UI - Added a Timeline option to the Thunderbird/Sunbird View menu
- UI - Added ability to open events from Timeline
- UI - Added Now line set by default at 256px
- UI - Added events based on event start and end time
- UI - Added tasks based on due date

