Merge pull request #56 from dbickson/master

Fixing ec2 tutorial deployment scripts
Merge pull request #57 from dbickson/master

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

fixing hadoop environment variables on ec2 image
Merge pull request #59 from dbickson/master

fixed JAVA_HOME in hadoop-env.sh
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
added documentation by jacob kesinger to his total subgraph centrality measure