Added a ChromePhpHandler.

Closes #56
Detect Chrome through the user agent in ChromePhpHandler

The header will be sent only to Chrome, avoiding issues with IE for
long headers.
Add MongoDB handler
Merge pull request #58 from stof/chromephp

Added a ChromePhpHandler.
Rename ChromePhp to ChromePHP for consistency with FirePHP
Add microseconds to the DateTime object
added GelfHandler for sending log messages to Graylog2
Merge pull request #60 from mlehner/microseconds

Add microseconds to the DateTime object
Update CHANGELOG
Fix datetime creation with microseconds
properly convert from a float to a string, including the digits after the decimal to please createFromFormat
Merge pull request #62 from mlehner/microseconds_float

Third attempt at fixing microseconds
Initial version
Add some documentation
Add license header and move @author to phpdoc
Remove Socket, PeristentSocket and MockSocket classes
Fix docs
add licensce and move @author to phpdoc
Fix doc/sockets.md
Remove old SocketTest.  Fix CS issues