Bumped deps
Added Changelog and .projectile files
 * Added activity, segment and measurement fns, that take valid maps and return mostly identical new ones, implementing IMeasured or IPointValue. This allows for a finer grained usage of the API
 * Added activity?, segment? and measurement? predicates, to validate data structures for each concept
 * Renamed the valid-sweat? fn to db?
 * TCX parser now uses sweatkit.core's API and returns an already reified data structure, as per th