Use date and activity name in filename

Exported file name will be in yyyymmdd_hhmm_activity.gpx form (similar to files downloaded from Runtastic page)

Thanks to @pskt for the PR!

Whole bunch of new supported activities!

• Merge pull request #5 from Runalyze/new-sport-types 6c3b725
• fix baf2893
• rename cycling -> ride aa7aecb
• fix typo 3f16556
• init d43d080
• Update README.md e1abad3
• Update README.md 898167c
• Update README.md 2f94f2c

v0.1.0...v0.2.0

Huge props to @mipapo for adding all the other activities!

Add support for road bike

• Merge pull request #1 from dmolle/master 7da9a8b
• Update README.md 8cf4234
• Added roadbike 5b1def5
• Update README.md 05ea92c
• Add instructions 7ab3ff2

v0.0.1...v0.1.0

v0.0.1

• Tweaks 587f878

93b7a66...v0.0.1