NR-325 : Improve scalability on multiple process machines

Made the multiprocess dispatch production server
NR-325 : Improve scalability on multiple process machines

Added more servers: wsgiref, cherrypy
NR-325 : Improve scalability on multiple process machines

Added more servers: wsgiref, cherrypy
NR-325 : Improve scalability on multiple process machines

Added proxy server.
NR-325 : Improve scalability on multiple process machines

Added proxy server.
NR-341 : Content type missing from CDM headers

Fixed by adding an error assembly.
NR-341 : Content type missing from CDM headers

Fixed by adding an error assembly.
Merge branch '325-Improve-scalability' of dev.sourcefabric.org:rest_api into 325-Improve-scalability

Conflicts:
	superdesk/plugins/ffmpeg-binary/resources/ffmpeg/Windows/AMD64/bin/ffmpeg.exe
	superdesk/plugins/media-archive-audio/superdesk/media_archive/impl/audio_persist.py
Merge branch '325-Improve-scalability' of dev.sourcefabric.org:rest_api into 325-Improve-scalability

Conflicts:
	superdesk/plugins/ffmpeg-binary/resources/ffmpeg/Windows/AMD64/bin/ffmpeg.exe
	superdesk/plugins/media-archive-audio/superdesk/media_archive/impl/audio_persist.py
Merge branch '325-Improve-scalability' into devel
Merge branch '325-Improve-scalability' into devel
Merge branch 'devel' of dev.sourcefabric.org:rest_api into devel
Merge branch 'devel' of dev.sourcefabric.org:rest_api into devel
Merge branch 'devel' of dev.sourcefabric.org:rest_api into devel
Merge branch 'devel' of dev.sourcefabric.org:rest_api into devel
Updated eggs info files
Updated eggs info files
Filter out include warning messages generated by setuptools
Filter out include warning messages generated by setuptools
Merge branch 'devel' of dev.sourcefabric.org:rest_api into devel