introduce larger icons
introduce source doc for vessel icons
first implementation of torpedoes
firing working, as is detonations
introduce the ability to fire down the bearing of a current sonar contact
introduce tooltip to explain torpedo options
* introduce count of remaining torpedos
* include torpedo template in scenario
introduce weapons mission
get scenario moving forward more quickly
first implementation of torpedoes
Merge pull request #15 from IanMayo/features/ian/torpedo2

Introduce two types of torpedo, plus a scenario to test them against.
introduce torpedo firing sound
Merge pull request #16 from IanMayo/features/ian/torpedo_sound

OMG - how cool?  There's now a sound when a torpedo is fired :-)
get the algorithms working from a single list
nearly there
reduce processing in updating vessel markers
only use the vessel marker method to initially create marker
last bit of tidying
Merge pull request #17 from IanMayo/features/ian/single_vessels_list

Switch to a single list of vessels  (algorithms only)
minor refactoring (renaming), single performance improvement