Adapt example "examples/high-frequency.py" from glumpy to vispy
Fix copyright and main call in high_frequency example
Fix naming convention in high_frequency example
Fix style and default size in high_frequency example
Merge pull request #506 from gbaty/move_high_frequency_sample_from_glumpy

Adapt example "examples/high-frequency.py" from glumpy to vispy
FIX: Fix travis
Merge pull request #513 from Eric89GXL/fix-trav

FIX: Fix travis
FIX: Minor fixes to text and better warnings for gloo
FIX: Fix decode