added welt2000 spec file.
added welt2000 sample release file.
updated airfield, added welt2000 parser.

updated airfield object with missing fields. added parser function to
the welt2000 package.
added go commander for list-releases.
added common waypoint and airspace objs.
dropped airfield Text field.
added skeleton for soaringweb handling.
added ls cmds for airspace and waypoint.
added waypoint parsing.
run tests per individual pkg (separately).
added goveralls to travis builds.
Merge branch 'master' of https://github.com/rochaporto/ezgliding