Fix multiple topic-updating issues.
First, IrcChannel setTopic messages were not previously parsed,
meaning that topic changes never showed up in Quasseldroid.  This
patch adds support for such messages.  Second, topic changes never
notified observers, causing the GUI to not be updated until the
selected buffer was changed.  This patch causes topic changes
(and, in the case of networks) network name changes, network server
changes, changes in the number of users, and changes in the lag
time to notify observers so the GUI is updated immediately.
Merge pull request #172 from mamarley/networknamechangefix

Add support for Network setNetworkName messages.
Merge branch 'mamarley-topicchangefix'

Conflicts:
	QuasselDroid/src/main/java/com/iskrembilen/quasseldroid/Network.java
Merge branch 'networksetcurrentserver' of https://github.com/mamarley/QuasselDroid into mamarley-networksetcurrentserver

Conflicts:
	QuasselDroid/src/main/java/com/iskrembilen/quasseldroid/io/CoreConnection.java
	QuasselDroid/src/main/java/com/iskrembilen/quasseldroid/service/CoreConnService.java
	QuasselDroid/src/main/res/values/ids.xml
Bumped version
Show buffer activity/unread/highlights even when parted.
Quasseldroid currently displays any parted buffer using the parted
buffer color, even if the buffer has activity, unread messages, or
highlights.  The problem is particularly bad for PM buffers with
nicks that share no channels with the user, causing no activity
to ever be shown for these buffers.  This patch makes Quasseldroid
use the same logic a regular Quassel, displaying activity, unread
messages, and highlights even if the buffer is parted.
Additionally, the patch removes the code in the Buffer constructor
that sets the buffer active if the buffer is a PM buffer, as this
action is now performed by BufferFragment.
New icons from Joppu.
This introduces a slightly modified Quasseldroid icon, but more
importantly brings larger size icons so that no upscaling is
necessary on xxhdpi and xxxhdpi devices.
New holo-style icons for the nick list expanders.
This updates the nick list expander icons to match the holo icons
used on Android 4 and up.
Merge branches 'buffertextcolorfix', 'expandericonupdate' and 'iconupdate' into allupdates