Makefile: split up 'make gource' into 'make gource' (render only) and 'make gource-record' (record using ffmpeg)
make: gource flags: add

    --key
    --camera-mode overview
    --highlight-all-users
    --file-idle-time 0
    --hide progress,mouse
    --stop-at-end
    --max-files 99999999999
    --max-file-lag 0.000001
    --bloom-multiplier 1.3
Merge pull request #102 from matthiaskrgr/cooking

gource stuff