Add security, classic algos update
Some minor updates
Update README.md

The inverted index is not related to graphs but is used in information retrieval
Update README-scratch.md
Update README.md
added Data Structures Folder
Update README.md
Merge branch 'master' into patch-1
Merge pull request #26 from dbonadiman/patch-1

Update README.md
Remove math import
update
Fixed the markdown Documentation link
Merge pull request #33 from sant0sh/master

Fix for 'Link to Markdown documentation is broken'
Fix markdown docs url
Delete .DS_Store
Fix #34
Real reverse algorithm #31
Add a Bitdeli badge to README
Merge pull request #35 from bitdeli-chef/master

Add a Bitdeli Badge to README
remove .DS_Store