NaiveGreedyModularityAlgorithm and GreedyModularityAlgorithm

[toniaTsif]

I added the implementation of Naive Greedy Modularity Algorithm and Greedy Modularity Algorithm, as they were missing from JGraphT. This algorithm is a greedy community detection algorithm, which uses modularity in order to define the communities. The implementation of the Greedy Modularity Algorithm was based on the paper "Finding community structure in very large networks" by Clauset, Newman and Moore.

• I read and understood https://github.com/jgrapht/jgrapht/wiki/Become-a-Contributor
• I read and understood https://github.com/jgrapht/jgrapht/wiki/How-to-make-your-first-%28code%29-contribution
• I added unit tests
• I added documentation
• I followed the Coding and Style Conventions
• I have not modified HISTORY.md or CONTRIBUTORS.md
• I ensured that the git commit message is a good one

[jsichi]

Thank you for your contribution! Checkstyle produced the following errors, so you will need to set up your editor according to our guidelines in order to avoid these.

https://github.com/jgrapht/jgrapht/wiki/Dev-guide%3A-How-to-setup-your-development-environment-for-JGraphT

Error:  src/main/java/org/jgrapht/alg/clustering/GreedyModularityAlgorithm.java:[53,1] (whitespace) FileTabCharacter: File contains tab characters (this is the first instance).
Error:  src/main/java/org/jgrapht/alg/clustering/GreedyModularityAlgorithm.java:[76,40] (extension) LocalVariableNameMain: Name 'DQ' must match pattern '^[a-z][a-zA-Z0-9]*$'.
Error:  src/main/java/org/jgrapht/alg/clustering/GreedyModularityAlgorithm.java:[108,61] (extension) LocalVariableNameMain: Name 'DQHeap' must match pattern '^[a-z][a-zA-Z0-9]*$'.
Error:  src/main/java/org/jgrapht/alg/clustering/GreedyModularityAlgorithm.java:[109,60] (extension) LocalVariableNameMain: Name 'DQHeapHandles' must match pattern '^[a-z][a-zA-Z0-9]*$'.
Error:  src/main/java/org/jgrapht/alg/clustering/GreedyModularityAlgorithm.java:[183,48] (extension) LocalVariableNameMain: Name 'DQik' must match pattern '^[a-z][a-zA-Z0-9]*$'.
Error:  src/main/java/org/jgrapht/alg/clustering/GreedyModularityAlgorithm.java:[184,48] (extension) LocalVariableNameMain: Name 'DQjk' must match pattern '^[a-z][a-zA-Z0-9]*$'.
Error:  src/main/java/org/jgrapht/alg/clustering/GreedyModularityAlgorithm.java:[187,48] (extension) LocalVariableNameMain: Name 'DQik' must match pattern '^[a-z][a-zA-Z0-9]*$'.
Error:  src/main/java/org/jgrapht/alg/clustering/GreedyModularityAlgorithm.java:[190,48] (extension) LocalVariableNameMain: Name 'DQjk' must match pattern '^[a-z][a-zA-Z0-9]*$'.
Error:  src/main/java/org/jgrapht/alg/clustering/NaiveGreedyModularityAlgorithm.java:[1] (misc) NewlineAtEndOfFile: File does not end with a newline.
Error:  src/main/java/org/jgrapht/alg/clustering/NaiveGreedyModularityAlgorithm.java:[45,1] (whitespace) FileTabCharacter: File contains tab characters (this is the first instance).
Error:  src/test/java/org/jgrapht/alg/clustering/NaiveGreedyModularityAlgorithmTest.java:[36,1] (whitespace) FileTabCharacter: File contains tab characters (this is the first instance).
Error:  src/test/java/org/jgrapht/alg/clustering/GreedyModularityAlgorithmTest.java:[35,1] (whitespace) FileTabCharacter: File contains tab characters (this is the first instance).

[d-michail]

Hi Tonia,

please adjust the source files to contain spaces instead of tabs and a new line at the end. Also please rename (refactor) the variables to start with a lowercase, for example DQik to dQik.