Added beginnings of logic for berserk attacks
- Added unit tests for BMAttackSpeed
- Added logic to halve the size of a berserk die after performing a berserk attack
Merge branch 'speed' into berserk
Added partial logic to change the berserk die after performing a berserk attack.

Missing is the list of skills that are lost after performing a berserk attack.
- Added unit tests to test Berserk attacks in a game context
- Generalised attack checking code to use BMSkill::attack_types()
Changed many function calls to call by reference, to allow change of die type from swing die to normal die after performing a berserk attack
Fixed swing die replacement during berserk attack to keep the original owner information
Made database and BMInterface changes to load_game() and save_game() so that chosen swing values persist even when the swing dice themselves do not exist any more
- Added unit tests to check that the swing values are cleared from the database at the end of the game
- Added a unit test to check that berserk dice cannot perform skill attacks. ***CURRENTLY FAILING***
Added logic to stop berserk dice from participating in skill attacks
- Removed unused name properties from BMAttack*.php files
- Removed unused name and type properties from BMSkill*.php files
- Added basic files for trip attacks, without corresponding unit tests
Changed BMDie->initiative_value to be a single value, instead of all possible values
- Added skeletons to BMAttackTripTest.php and BMSkillTripTest.php
- Added closing PHP tags to PHP files
Added basic unit tests, not yet integrated with BMGame
Added basic unit tests, not yet integrated with BMGame
* clarify error message when nonnumeric swing values are entered
* fix swing set box alignment and size (Fixes #76)
Added test cases to BMAttackBerserkTest.php
Merge pull request #128 from cgolubi1/tkt-76

* fix swing set box alignment and size (Fixes #76)
Merge pull request #127 from cgolubi1/tkt-78

* clarify error message when nonnumeric swing values are entered