Garmin sdk in maven + add support for surface interval

[lucagiovagnoli]

Just opening a pull request here in case it's useful to anyone, doesn't need to be merged in, I used the following code to convert my dives from my Mosquito.

What

1. I added the Garmin SDK import from Maven repository
2. Building as a fat jar.
3. Supports conversion of surface interval time too.

Testing

• Tested with Suunto Mosquito SDE divelog on Linux.

java -cp ./target/SdeToFit-1.0-SNAPSHOT-jar-with-dependencies.jar  com.github.nradov.sdetofit.SdeToFit  ./Divelogs.SDE  output/
Converting dive log: "0.xml"
Converting dive log: "1.xml"
Converting dive log: "2.xml"
Converting dive log: "3.xml"

• I had to remove the check for DOCUMENT_ELEMENT_NAME because the Mosquito doesn't log that. Hopefully this doesn't break for the D3 or other computers.