added few methods for calculating distances from one patent id to all
other patent id's
Created a class for finding termfrequency and Idf values for all the
words in the corpus
Merge remote-tracking branch 'origin/mahout-classification' into
core-utils

Conflicts:
	java/patent-analysis/src/test/java/com/learnr/pa/rpx/excel/PatentExcelReadTest.java
code for  distance measures
Merge remote-tracking branch 'origin/mahout-classification' into
core-utils

Conflicts:
	java/learnr-core/src/main/java/com/learnr/core/visualization/ClusterPlot.java
	java/patent-analysis/src/test/java/com/learnr/pa/rpx/excel/PatentExcelReadTest.java
Core-utils : updated/moved the core plotting to learner-utils
Added javadoc and refoctored the code.
core-utils : text processing utility updates
Merge branch 'master' into core-utils

Conflicts:
	java/patent-analysis/src/test/java/com/learnr/pa/rpx/excel/PatentExcelReadTest.java