1) Added support for writing the output to filesystem for later comparison among various algorithms. 2) Added some optimisations like removing unnecessary sorts in Itemset. 3) Fetch only itemID in SQL query to reduce network data transfer. 4) Changex extension of output graphs to .png 5) Added support to also fetch the number of candidate sets generated for each experiment for AIS.
Merge branch 'master' of github.com:SaurabhAggarwal/cs764

Conflicts:
	src/algos/Apriori.java