dashboard: add windows fields for projects and settings
dashboard: fix typo in jobs.html
server - jobs.py: add windows stuffs and debug empty blender_path
server - project.py: add windows stuffs and fix empty active project
server: remove percentage = 100 => task completed [that's the worker job]
server: add windows path field in Project model
worker: make it windows compatible [select and getloadavg are not supported]
server - projects : fix indentation and unset "active_project" if the last project is deleted
worker : add NONBLOCK flag to subprocess I/O
add possibility to disable a non connected worker
fix shots update return in dashboard
server may not found any ready jobs
Merge pull request #44 from msimoncz/port-windows

Port windows
add thumbnail management: they are generated and the end of a job
the most recent one is displayed
if the shot is reset, thumnbails  are deleted
print the blender output during job working instead at the job end
update gitignore
remove useless calls to system_path
remove all system_path calls (python seems to handle path very well); add gobal var RENDER_PATH
add Pillow to requirements
add possibility to choose render format at shot creation; format: PNG, JPEG, MULTILAYER, TGA