added implementations of simple rule and unit tests
Fixed typos
fixed some spelling and changed to caretsian system in test
Merge branch 'simple-rule-implementation' of https://github.com/ragnhildkarlsson/Othello into simple-rule-implementation

Conflicts:
	src/kth/game/othello/simple/SimpleRules.java
fixed comment and variable name in private method getSwappableNodesInDirection
Fixed typos
added comment how mocking of board is avoided in testMoveOnOccupiedNodeShouldSwappNoNodes
Merge branch 'simple-rule-implementation' of https://github.com/ragnhildkarlsson/Othello into simple-rule-implementation
Merge pull request #19 from ragnhildkarlsson/simple-rule-implementation

added implementations of simple rule and unit tests