Squashed commit of the following:

commit 4972b62de8918ad9ff5e991ef5332c07087796db
Author: filin20 <filin.20@gmail.com>
Date:   Sun Mar 16 11:46:33 2014 +0200

    update btsync to 1.2.92

commit 27a1d4023ef0c66b20149199d8ea8b9163506015
Merge: feac255 2333f88
Author: filin20 <filin.20@gmail.com>
Date:   Sun Mar 16 11:33:32 2014 +0200

    Merge remote-tracking branch 'upstream/develop' into develop

commit feac2557feb555c26d8398e73791bee64fd1b422
Author: filin20 <filin.20@gmail.com>
Date:   Sat Mar 15 13:59:22 2014 +0200

    update btsynk to 1.2.91

commit 2333f88f83fc36e01b07fb14d1d8a9224e96e1d3
Author: Dr-Bean <github@beanpoint.com>
Date:   Wed Mar 12 17:15:16 2014 +0100

    Add compiler flag -O2 back to unrar, ref #847
Merge branch 'develop' of https://github.com/filin20/spksrc into develop