Add exception details to EventManager error log
Fix setting 1GB/s speeds in gtkui
Cleaned up torrents.py and small change to decode_string

Replaced some try/except-decoding with decode_string.
Removed redundant methods ti_name and apply_options.
In decode_string - changed last encoding (with ignore) from
chardet-detected to the encoding specified in key-argument.
Replaced ti_-functions with lambdas
Added GtkAdjustment to the port spinbutton
Removed redundant has_metadata function from torrent.py
Merge remote-tracking branch 'bro/master-torrent-encoding-cleanup'
Fix renaming folders on libtorrent 0.16 compiled with unicode support (Windows)