Merge pull request #32 from egbertbouman/improvements

Improvements for the 6.1 release
Update checkout instructions with https checkout
Merge branch 'devel' of github.com:Tribler/tribler into devel
Merge pull request #36 from egbertbouman/improvements

Fix for swiftmetadir not being set properly + fix download button state
Merge pull request #38 from egbertbouman/improvements

Improvements
Merge pull request #40 from egbertbouman/improvements

Fix for libtorrent torrent collecting
Move up to the latest updates for 6.1.x metadir feature