Modify modules to support mobile events
   * Add isMobile parameter which defines if user is connected with mobile device
   * Use basic datatype for HEALPixFITSLayer if video card don't support floating point textures
Make layout compatible with mobile devices
Hide feature popup only when visible, fix height on showing
Refactor updateFov function to MollweideViewer
Hide FITS button if client device is mobile
Fix some minor W3C standards
Hide compass module on mobile due to low performance
Fix vertical nicescroll offset
Some css cleanup/refactor
Merge branch 'tablet'
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