added G4 hook to increase the timeout for serial communication
WIP: Adding option to start printing directly after slicing
Added possibility to say to select or directly a file right after slicing it finished, both to the API and the UI
Removed old printer parameter and appearance settings and added auto migration of config
Fixed URL endpoint for printer profile API, it's supposed to be "api/printerprofiles", not "api/printerProfiles"
Fixed a bug causing the _default profile to be saved to a file instead of config.yaml
Make sure the printer profile fields are all of the correct type during validation
Don't hiccup on slic3r filament_diameter comments generated for multi extruder setups
Added entry to change log
Merge branch 'master' into devel
"autoconnect" parameter to "connect" command is not mandatory

Closes #675
Fixed jog controls

Closes #664
Actually use caching when reading metadata (was a write-only cache previously, way to go...)
More error resilience when logging success/failure of prints
Print time estimation is now not displayed until it becomes somewhat stable
Removed a left-over from print time estimation experiments that got overlooked
Removed a possible race condition when slicing to the same gcode file in direct succession
Added new plugin type ProgressPlugin

Plugins can implement that to get notified of progress in both print and slicing jobs in 1% increments.
Pauses in the print job are now cleaned from the basis for print time estimation, also switched to a rolling window approach for determining when estimation becomes stable
Merge branch 'issue_658' of https://github.com/vishnubob/OctoPrint into vishnubob-issue_658

Conflicts:
	src/octoprint/util/comm.py