graph: add support for dead links

There is no support for dead links showing.
Added this support.
Merge pull request #22 from gurugray/deadLinks

graph: add support for dead links
add schorcut for checking OID is dead
Added jshint and jscs
added gitignore for node_modules
Checking with jshint and jscs
Fixed rules
Fixed paths in make file
Added grunt
Added task lint for jshint and jscs running
Added empty default task

fixes after review
Added bower for external libs
Added grunt task for bower
Bower can't be used separately
After npm install bower runs automatically