this submit is for code format
add a comments for mess code display
format for all files
Merge branch 'master' of https://github.com/omadesala/sampler

Conflicts:
	sampler/src/main/java/com/sample/distribution/implement/GaussDistribution.java
	sampler/src/main/java/com/sample/distribution/implement/TwoDimGaussDistribution.java
	sampler/src/main/java/com/sample/sampler/implement/GaussMHSampler.java
	sampler/src/main/java/com/sample/sampler/implement/MixdGaussMHSampler.java
update the new version