Catch exception in pathExists

 boost::filesystem::exists() throws
/ is not always readable
[tools] Performance monitoring tooling
Merge pull request #374 from LTD-Beget/gonna_catch_them_all

Catch exception in pathExists
Merge pull request #375 from facebook/feature-perf-tooling

[tools] Performance monitoring tooling
typo fixes - https://github.com/vlajos/misspell_fixer
Merge pull request #378 from vlajos/typofixes-vlajos-20141107

typo fixes - https://github.com/vlajos/misspell_fixer
Delete .travis.yml
Update README.md
Socket_inode and port_inode tables to map PIDs->ports via netlink inet_diag
Example query:
```
SELECT port.local_port,
       port.remote_port,
       port.local_ip,
       port.remote_ip,
       socket.pid,
       process.name,
       process.cmdline
       process.path
       FROM socket_inode AS socket
       JOIN port_inode AS port
       ON socket.inode = port.inode
       INNER JOIN processes AS process
       ON socket.pid = process.pid;
```
Updated
free(linkname) and no more 'self'
linux-headers-generic