Resolved issue in likelihood calculation for LDA.  Note that likelihood calculation is relatively slow (costly) and probably should not be enabled by default.
To accelerate likelihood calculations I have added code to precompute the loggamma for a range of common values.
Merge branch 'master' of https://github.com/graphlab-code/graphlab
Merge pull request #44 from jegonzal/lda_likelihood_calculation

Improved Likelihood calculation stability.
fixed accuracy of svd computation of first singular value - thanks to carlos del cacho for bug reporting
merging svd from other branch
Merge pull request #45 from dbickson/master

fixed computation of first singular value in svd
Merge pull request #47 from dbickson/master

added a note about likelihood interval calculation
added a note about likelihood interval calculation
Merge pull request #49 from dbickson/master

fixing svd defaults and documentation to have a clearer output
fixing svd defaults and documentation to have a clearer output
Fix minor typo in basic GraphLab tutorial
Merge pull request #50 from iglesias/master

Fix minor typo in basic GraphLab tutorial. Thanks Fernando for your fix!
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