Changes to 'dev/multiple_uids'

[Sandro Knauß]

New branch 'dev/multiple_uids' available with the following commits:
commit dd2947da7d2473063286b59cb3ec498d8fdcbb28
Author: Sandro Knauß <knauss at kolabsys.com>
Date:   Wed Nov 5 17:52:38 2014 +0100

    Using item(instance) instead of item(uid)

commit 1523fe0ca3e4d8358d2d6cba37b6c35854d5d37f
Author: Sandro Knauß <knauss at kolabsys.com>
Date:   Wed Nov 5 17:47:08 2014 +0100

    calendarviews/journalview: Use ViewCalendar instead of ETMCalendar

commit 2e4f7f1651a02e87a446932f83b0f9019b3b05d6
Author: Sandro Knauß <knauss at kolabsys.com>
Date:   Thu Oct 30 12:31:21 2014 +0100

    use calendar(incidence)->uid instead of incidence->uid
    
    to handle incidences with same uid in different calendars

commit ebcf1442a1b3827487af3ca0a1de7817352047e7
Author: Sandro Knauß <knauss at kolabsys.com>
Date:   Thu Oct 30 12:28:05 2014 +0100

    calendarviews: Add support to handle mutiple calendars
    
    This is needed to support to handle incidences with same uid in
    different calendars.