Add icons on the tracks list, change his layout a bit.
Add a default track SVG icon. Remove some useless metadata from previously added SVG.
The default track icon has now a thinner line. Add 2px of margin between icon and title.
Merge branch 'develop' of https://github.com/nicodel/Run-Bike-Hike into develop
Merge pull request #38 from Bonbadil/develop

Add icons on the tracks list, change his layout a bit.