Differential Evolution and RRPlugins C API

Sorting out life in O(1) is luck.

In this week I have added support of Differential Evolution. So, I am left with the swig wrapper problem for the last week. But the build of Travis CI is failing due to some error in uniform real number generation. Also, there is some build problem with Travis CI with RRPlugins C API. To be specific there is some lapack issue. I have referred these two links https://en.wikipedia.org/wiki/Differential_evolution and http://www1.icsi.berkeley.edu/~storn/code.html#c++c for the differential evolution part. For the RRPlugins C API, I have used pre-existing API from rrplugins (https://github.com/sys-bio/rrplugins/tree/master/wrappers/C).

In this ultimate final week, I will first finish off with the documentation part first and then figure out with wrapper problem. I am looking forward to merging these changes to the main repository. Also, have to present all my hard work this summer. Looking forward to wrapping up the project quickly.

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