Update README.md

Updated insight project code
Updated Graph VisitorInterface and added an additional check in Profiler::setShutdownFunction()
Add a Bitdeli badge to README
Updated the version of the xhprof extension dependency
Updated README to fix install procedure
Added hhvm to travis
Added support for scrutinizer CI
Added support for scrutinizer code coverage report
Added poser badges
Simplified InclusiveLoadingStrategy to remove code duplication
Updated scrutinizer configuration
Fixed a few code syntax related issues
Refactored Graphviz dumper

* Integrated visitor pattern to navigate through the graph
* Moved formatting logic out from the callgraph display
Code syntax compliance
Removed unused use statements in GraphvizDumper
Fixed code quality issues
Fixed issues with the graph visitor

* Fixed a bug where the visitor would visit the same edge twice
* Fixed calculus for graph vertices which need metrics from multiple edges
* Better separation of concerns for GraphvizVisitor, which used to parse the vertex when inside the visitEdge method
Incremented version in composer.json
Fixed unused variable
Fixed remaining issues from scrutinizer report