Squashed commit of the following:

commit df48c4827e05243c137187bb0d9f157327c26b86
Author: Milind Barve <milind@datatorrent.com>
Date:   Tue Apr 1 15:04:51 2014 +0530

    Demo guide for Yahoo finance with Derby SQL demo application. #MLHR-982

commit 7b1ced0d7a18ff68c163b0b6c6628702649e1e63
Author: Milind Barve <milind@datatorrent.com>
Date:   Tue Apr 1 15:04:16 2014 +0530

    Demo guide for Yahoo finance with Alerts demo application. #MLHR-980

commit c43465d8f8235b5049bf71a30e5b95702a6f2153
Author: Milind Barve <milind@datatorrent.com>
Date:   Tue Apr 1 15:00:15 2014 +0530

    Demo guide for Yahoo finance demo application. #MLHR-981
MLHR-1073 #resolve Handle multiple unified group elements in a set
Merge pull request #926 from sashadt/dt-dev

MLHR-1091 #resolve #comment Updating demo application names
make BufferedReader transient
fix compile eror
advancing batch start by num events
Merge pull request #927 from sashadt/dt-dev

MLHR-1092 #resolve #comment Adding environment varialbles override to ap...
reset batch start index in end window
MLHR-1038: Writing partitionable unique count operator, and a demo app
to demonstrate/validate the operator.
Formatting code as per coding guidelines
Application for counting unique occurences of key-value pairs
Generate key value pairs randomly
Add package-info.java for demo application
Add newline at end of file
Set default application name using annotation
Send output of verifier to counter, so that we can see number of failures/success on
gateway ui, increase tupple blast on generator.
TwitterTopCounter doc fix
#fix MLHR-1093
Merge pull request #929 from gauravgopi123/MLHR-1093

MLHR 1093
minor reformatting.