Added clean error message when user not found with giver username
Changed to use Bootstrap dismissable alert boxes for messages
Changed default for link to anchor-button, generally looks nicer
Changed authz failure log message to debug from info, can be a lot of these in normal operation for users with limited permissions
Changed to disable links when user is not permitted (no authz) as well as transition condition failure
Improved disabled links to be like buttons if applicable for link type
Added release note about diabled links for no authz
Screen paths can now start with a // and be a sparse path where each
    name in the path is searched for in the subscreen hierarchy from the
    root screen; can also find content this way; note that this may
    involve loading a lot of screen definitions and in dev mode will be
    a LOT slower, but in production (cache timeouts turned off) the full
    expanded path is cached as are the screen definitions so there is very
    little overhead
Made screen path searching a little more efficient and consistent with breadth-first; To help with XML Screen loading overhead, especially in dev mode with
    timeouts turned on, now only reloads if the file's last modified time
    has changed
Small improvements to shaded-area style
Added cache warming on start (disabled in dev conf)
Improved artifact stats screen info
Small change to show current screen numbers plus subscreens
Added date-period for finding in a date range with basic drop-downs in the UI, and input handling code handles any offset
Changed to select based on parameters in date-period drop downs
Merge pull request #6 from sssonline/master

6