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Merge pull request #147 from kb2623/master

### New algorithms
* Krill Herd
* King Monkey Evolution V3
* Glowworm swarm optimization
* Harmony search
* Hill climbing
* Fireworks algorithm
* Simulated aneling
* jDE variation with dynamic population size
* Gravitational search algorithm

### New benchmark function
* Trid
* Perm
* Infinity, ...

### Maximization
Added maximization for objective function with enum OptimizationType. For maximization use option MAXIMIZATION. When constructing Task class set optType argument. 

### Fixed interfaces
Added random methods to Algorithm class. 

### New tests
Added tests for new optimization algorithms and new benchmark functions.

### Python version
* Works on Python 2.7
* Works on Python 3

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