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.
Merge pull request #175 from mamarley/buffertextcolorfix

Show buffer activity/unread/highlights even when parted.
Merge pull request #176 from mamarley/iconupdate

New icons from Joppu.
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 pull request #177 from mamarley/expandericonupdate

New holo-style icons for the nick list expanders.
Bumped version
Merge latest changes from master