Merge remote-tracking branch 'upstream/master'
Merge pull request #80 from dbickson/master

Working on open source benchmarking for ec2
Merge pull request #81 from dbickson/master

adding more traces to track svd performance
Merge pull request #82 from dbickson/master

Improving benchmarking, using hvm ec2 instance
Merge pull request #83 from dbickson/master

added ec2 benchmarking script
Merge remote-tracking branch 'upstream/master'
use size_t in conting_sort
Merge pull request #85 from haijieg/master

User size_t counter in conting_sort
Fix to approximate_diameter to compile on clang.
Merge pull request #86 from ylow/master

Fix to approximate_diameter to compile on clang.
improved svd performance, fixed a bug of missing orthognoalization step