Added pagination for gcode files.
Added checkbox to enable autoscroll in the terminal tab.
Use UTC timestamps only for the temperature graph. Should get rid of weird timestamps in case server and client are in a different timezone.

Also fixed the "display minutes since the epoch when not connected to a freshly started server" issue ;)
Switched config format from ini to yaml to allow more complex configuration options (in this case for custom controls)
Further work on custom controls and custom bitrate for timelapses
Merge branch 'master' into devel
Added custom controls via configuration file.

Closes #13
config.ini is now config.yaml
parametrized_command => parametric_command
Gcode filemanagement now lives in its own module. Upload triggers gcode analysis, result is stored into metadata file. Print jobs triggered and their results are saved as well. Adjusted UI to display gcode analysis result and last print date and (color coded) result if available. Also adjusted gcode file list to color code entries according to last print result.
Fixed exception triggered on analysis abort
Initial gCodeViewer (http://github.com/hudbrog/gCodeViewer) integration
Initial implementation of autoupdate gcodeview on status from server
Auto-load file on connect; some refactoring
Bug: octoprint deleted all commented lines, now gcodevisualizer deletes them too so the line numbers match
gCodeVisualizer can be enabled as a feature in config now (enabled by
default)
Some cleanup from initial integration: removed separate icon for viewing gcode
Fixed some residual stuff after rebase
Remove duplicate css files
Revamped gcode analysis.

Now UI and backend take data from saved metadata (if available). Metadata gets written after file upload and also on startup (for files that have not been added yet). Gcode analysis is interrupted if a printjob is started and resumed when it ends. Frontend is notified when new metadata comes available and UI triggers reload of gcode file list.  Also started on implementing proper logging.