added toJSONString in Posting and PostingList
*fixed outofboudexception
Merge branch 'master' of https://github.com/thornwishstalon/turbo-octo-dangerzone

Conflicts:
	src/index/InvertedIndex.java
	src/index/SPMIInvert.java
	src/index/entities/Posting.java
	src/index/entities/PostingList.java
	src/processor/pipe/AbstractPipeStage.java
	src/processor/pipe/CaseFolding.java
	src/processor/pipe/Filter.java
	src/processor/pipe/Indexing.java
index merge vaguely working... probably wrong frequency values