* Version of touch interface for user study that has disabled panning and limited zoom to prevent zooming through the planet surface

* Update starlabels.data file

* Enable minimum picking distance in NDC

* Fix stack corruption bug in TouchMarker

* Version of touch interface for user study that has disabled panning and limited zoom to prevent zooming through the planet surface

* Fix stack corruption bug in TouchMarker

* Add time limit to levmarq solver

* Add debug properties to touch GUI with a compile time flag

* Guard against accessing outside bounds

* Added exponential zoom for faster zoom with increased distance from focus node

* Refined the exponential zoom for better behavior on the touch table

* Added properties for disabling panning and node boundary sphere multiplier for zoom

* Added more debug logging and stopped using camera focusNode (looks deprecated) for distance calculation

* Found error in the deceleration algorithm

* Default-disable debug logging, exponential zoom coeff change and additional debug log statement

Modified SGCT configuration commands to allow aspect ratio tracked keyword in openspace config file (#560)

Web GUI from Klas Eskilson (three new modules: webgui, webbrowser and cefwebgui)
Parallel connection refactorization
Wormhole server added to the main repository
Transfer function editor work from Cristoffer Särevall
Update ghoul

 * Fix Triton asset file
 * Display an error if no Property matches a regex in setPropertyValue
 * Correct user-facing name for some Moon assets
 * Add fade in and fade out helping functions
 * Reenable label fading in New Horizons
 * Added GUI hint to hide uninteresting nodes
 * Set Hidden Hint on barycenter nodes

Fix Lua state leaking when setting delta time

  * Introduced guiName to PropertyOwner
  * Added requirement that PropertyOwner::identifier may not contain whitespaces
  * Changed Name to Identifier in asset and scene files
  * Added new PropertyOwner to RenderEngine that owns the ScreenSpaceRenderables
  * Moved Name and GuiPath into GUI group
  * Added user-facing names to layer groups

* Removed unused cached uniforms from execution.

Feature/performance atm

# Conflicts:
#	data/assets/default.scene
#	data/assets/scene/solarsystem/planets/earth/earth.asset

Satellites Working with Asset

Add more satellites

* Print error message when a resource synchronization is rejected

Fixed compiling issues with log, reset night layer configuration and disabled earth's shading by default. (#552)

 * Implemented property animation mechanism
 * Added easing functions to Ghoul and make them usable in animation
 * Make sure that we don't leave properties around if SceneGraphNodes are deleted
 * Adding opacity settings to base renderables

Make URLSynchronization and HTTPSynchronization download into temporary files and if the download succeeds, transactionally move the temporary file into the correct destination

Add PerformShading asset parameter for RenderablePlanet
Disable shading on default for Earth