Sparklines  + Altitude

Added 4 sparklines graphs (pulse, speed, altitude, power). The bike
power should increase/decrease according to the altitude variation.
Screenshots

Added two screenshots
Added screenshot
fix screenshot link
Updated README.md
Embedded webserver

Embeds NanoHTTPD server making the application self-contained.
Self-contained app
removed properties
Merge branch 'master' of https://github.com/briacp/jergoviewer