Merge branch 'master' into dev
Added thread-safe counter examples
Added clearer StrategyType
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Add constructor to generate a random minefield
Add a program to generate random minefields
Be consistent with minefield representations
Added more concurrency examples
Moved minesweeper into concurrency directory
Added running time graphs for Jacobi implementations
Added simple OO example
Fixes to minefield example
Auxiliary scripts for the Minesweeper example
Bug fixes to simple concurrency examples
Added k-means example with mrjob
Merge branch 'dev'