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Now travis will build on the native Ubuntu 14.04 (trusty) system, but with new Qt and gloox packages.

Before kaidan always search in the source path (also on real installations),
now kaidan only searches in the DEBUG_SOURCE_PATH, if the current build is a
debug build.

I also added the missing parameter to enable i18n support.

Originally by @probonopd
https://github.com/KaidanIM/Kaidan/issues/141#issuecomment-346896890

Fixes #141.

https://standards.freedesktop.org/menu-spec/latest/apa.html

Fixes #131.

There was just one comma too much, that broke everything. Idk why I
haven't noticed that before ...

Fixes #132.

Don't use an explicit gpg key server.

Adds a short summary of what happened in the last two months (yey only
two instead of the normal 4 months).

I'm going to release it tomorrow. :)

Unfortunately SQLite3 doesn't support the 'simple' removal of one column
using `ALTER TABLE`, so we have to use a workaround. This is copying
everything except the `avatarHash` into a new table and then replacing
the old table with it.

This isn't needed anymore, since we populate the data via. Q_PROPERTIES
and the AvatarStorage.

This makes the avatars also rounded on the roster page.
I think this looks much better than the previous alternative with the
hard edges/corners.

This adds a new RoundImage QML type, that has a QtGraphicalEffect for
removing the corners and making it rounded (this is currently the only
way doing it, since an Image has no radius property as a Rectangle).

The avatar is now also a bit larger, I think it looks better so.
I removed mipmap filtering for the avatars on the ChatPage, because it
looked not good and a bit blurred on the avatars I tested it with. Maybe
I'll change that later again.

This will make it possible to show automatically updating avatars of a
specific JID. Also the avatar hashes don't have to be saved in the
message database anymore, and so problems when changing accounts are
fixed now.

The AvatarStorage now has a signal, that is emitted when the avatar of a JID
was changed. Connected to it is the NOTIFY signal of the Q_PROPERTY of
the avatar storage, so all avatars are updated then.

This changes the design of the ChatPage or the underlying ChatMessage
object to show the date and a green checkmark if delivered.

The green checkmark is from Conversations (GPLv3).

The time format is 'dd MMM, hh:mm' / '31 Dec, 23:59', but it would
probably be better if this format would be changed dynamically, so that
all messages of the current day only show hours and minutes and messages
older than one year also show the year.

Closes #103, closes #104.

This will improve the quality of the avatars, so they're not 'pixely'.
But of course this will cost more performance.

This will fetch the user's VCard on connection, will be needed to edit the VCard
e.g. for changing the avatar.

Whenever a subscribed contact has changed its avatar/photo in its VCard according to XEP-0154:
vCard-Based Avatars, a presence info is sent to the client. This will cause the VCardManager now to
request the new VCard and so updating the avatar.

XEP-0154: vCard-Based Avatars:
https://xmpp.org/extensions/xep-0153.html
https://camaya.net/api/gloox/classgloox_1_1VCardUpdate.html

This fixes that the avatars couldn't be written and read, if the directory hasn't exist
before.

This implements XEP-0054: vcard-temp, but only handles the avatar/profile picture.
Avatars (and everything else in the VCard) will currently only be updated on connecting.
For changing this, we need to implement XEP-0153: vCard-Based Avatars, that will send
presences with notices of updated VCards.