Merge pull request #52 from dbickson/master

fixed documentation of connected componetns to be clearer
fixed documentation of connected componetns to be clearer
added a sanity check that private ssh key permission should be 400 (or else ssh and scp fail later in some cases without warning
Merge pull request #54 from dbickson/master

added a sanity check that private ssh key permission should be 400 (or e...
fixing a bug related to not finding the running instance see : https://spark-project.atlassian.net/browse/SPARK-749
fixing various issues related to ec2 demo esepcially handling of ssh keys
git push
Merge pull request #56 from dbickson/master

Fixing ec2 tutorial deployment scripts
at last, fixed gl_ec2 script to work with new ami image
fixed setup-hadoop file to point to newer haddop (1.2.1)
Merge pull request #57 from dbickson/master

Fixed ec2 script to work with newer AMI and newer hadoop version (1.2.1)
fixing hadoop environment variables on ec2 image
Merge pull request #58 from dbickson/master

fixing hadoop environment variables on ec2 image
fixed JAVA_HOME in hadoop-env.sh
Merge pull request #59 from dbickson/master

fixed JAVA_HOME in hadoop-env.sh
fixed newer java version, bug in port number in mapred-core.xml
Merge pull request #60 from dbickson/master

fixed newer java version, bug in port number in mapred-core.xml
Checking for invalid alpha and beta parameters to gaurd against invalid alpha and beta initial values.
Merge pull request #61 from jegonzal/lda_lgamma_zero_fix

CGS LDA does not validate the alpha and beta parameters.
Total Subgraph Centrality
Merge pull request #62 from kesinger/master

Total Subgraph Centrality