DRM, Thumbnail and Analytics Updates

• We now support TTL based DRM as well as offline DRM.
• Improved thumbnail support - thumbnail can be generated even after video is processed and it can be at any second. We have also enabled support for GIF thumbnail.
• Usage analytics can now be seen for any single video. Previously it was only at collection level
• We now support billing alerts so customers are notified when their bills go above certain value
• Added search support to blog and learn sections